In the early twentieth century, a mysterious disease swept through the Japanese military. Soldiers who had once been healthy and strong began experiencing persistent fatigue, irritability, memory problems, and poor sleep. As the condition progressed, many developed shortness of breath, swelling in the legs, muscle weakness, difficulty speaking, paralysis, and, in severe cases, death.
At first, military physicians suspected infectious diseases such as bacteria or viruses. However, the true cause was hiding in plain sight: the soldiers' diet. The widespread replacement of nutrient-rich brown rice with polished white rice had unknowingly removed a critical nutrient from their daily meals: vitamin B1, also known as thiamine.
The soldiers were suffering from beriberi, a disease caused by severe vitamin B1 deficiency. At the time, white rice was considered a symbol of prosperity and modern living. To encourage enlistment and improve morale, it became a staple food within the military. What was not yet understood was that the polishing process removed most of the grain's natural thiamine content, leaving white rice with only a fraction of the vitamin B1 found in brown rice.
As thousands of soldiers became ill, researchers eventually discovered the connection between nutrition and disease. Once vitamin B1-rich foods such as vegetables, legumes, potatoes, and brown rice were reintroduced into the diet, recovery rates improved dramatically. This breakthrough would later become one of the most important discoveries in nutritional science and helped establish the essential role of vitamins in human health.
Why is vitamin B1 so important?
Vitamin B1 consumption is not simply about gaining additional health benefits; it is about survival. Every cell in the human body depends on thiamine to produce energy, making it one of the most fundamental nutrients required for life. Without adequate vitamin B1, the body cannot efficiently convert carbohydrates into the energy needed to power the brain, nervous system, muscles, and heart.
This is why vitamin B1 deficiency can have such profound consequences. As demonstrated by the historical cases of beriberi, insufficient thiamine intake can lead to fatigue, cognitive decline, nerve damage, cardiovascular complications, and, in severe cases, life-threatening illness.
As one of the key vitamins involved in cellular energy production, thiamine forms the foundation upon which many other aspects of health are built. From supporting mental clarity and nervous system function to maintaining physical performance and cardiovascular health, vitamin B1 plays a critical role in helping the body function optimally every day.
Vitamin B1 contributes to:
- Normal energy-yielding metabolism
- Healthy nervous system function
- Normal psychological function
- Cognitive performance and mental focus
- Healthy heart and muscle function
- Reduced tiredness and fatigue
Despite its importance, modern diets rich in processed foods can provide less thiamine than diets based on whole grains, legumes, nuts, seeds, and vegetables. Additionally, factors such as chronic stress, excessive alcohol consumption, digestive disorders, and increased physical demands may further increase the body's need for this essential nutrient.
At Sanbera, we view vitamin B1 not as an optional addition, but as a foundational nutrient. Because energy production lies at the core of resilience and long-term wellbeing, thiamine is included in every Sanbera formula as part of our commitment to supporting the body's most fundamental biological processes.
In this article, we will explore the functions of vitamin B1, its scientifically supported health benefits, the signs of deficiency, and why maintaining optimal thiamine levels remains essential for lifelong health.
What foods contain vitamin B1?
Because vitamin B1 (thiamine) is a water-soluble vitamin, the body stores only limited amounts and cannot maintain large reserves for long periods. Any excess is naturally excreted, making toxicity from food or standard supplementation extremely rare. However, this also means that a regular dietary intake of vitamin B1 is essential to support continuous energy production, nervous system function, and overall health.
Fortunately, thiamine is found in a wide variety of foods. The richest natural sources are typically whole, minimally processed foods, particularly those that retain their outer layers where many vitamins are concentrated.
Foods Rich in Vitamin B1
Some of the best dietary sources of vitamin B1 include:
- Whole grains, particularly brown rice and oats
- Legumes such as lentils, beans, chickpeas, and peas
- Soybeans and soy-based foods
- Nuts and seeds
- Potatoes
- Asparagus
- Cauliflower
- Kale and other leafy green vegetables
- Nutritional yeast
Historically, the difference between whole grains and refined grains played a significant role in public health. As seen in the beriberi epidemic among Japanese soldiers, removing the nutrient-rich outer layers of rice dramatically reduced its vitamin B1 content, leading to widespread deficiency despite adequate calorie intake.
Why modern diets can be low in vitamin B1
While severe thiamine deficiency is less common today, modern eating habits can still contribute to suboptimal intake. Highly processed foods often contain fewer naturally occurring nutrients than their whole-food counterparts, and many people consume fewer legumes, whole grains, and vegetables than recommended.
In the United States, food manufacturers are required to fortify certain staple foods, including flour, bread, and breakfast cereals, with essential vitamins and minerals. As a result, a substantial portion of the population's vitamin B1 intake comes from fortified products rather than naturally occurring food sources.
In many European countries, however, food fortification is far less widespread. This places greater importance on maintaining a nutrient-dense diet rich in whole foods. For individuals with increased nutritional needs, restricted diets, high stress levels, intensive physical activity, or digestive issues that may impair nutrient absorption, supplementation can also help support optimal vitamin B1 status.
The key takeaway is simple: because vitamin B1 cannot be stored in significant amounts, daily intake matters. Consistently consuming thiamine-rich foods or supplementing when appropriate, helps ensure the body has the resources it needs to produce energy, support cognitive function, and maintain long-term health.
Vitamin B1 and metabolism
Metabolism is often described as the body's engine. It encompasses the countless chemical reactions that occur every second to convert food into energy, repair tissues, support organ function, regulate hormones, and sustain life itself. From breathing and digestion to muscle contraction and brain activity, virtually every biological process depends on efficient energy metabolism.
Vitamin B1 plays a central role in this system.
This vitamin acts as an essential cofactor in the metabolic pathways that convert carbohydrates into usable cellular energy. It helps transform the food you eat into adenosine triphosphate (ATP), the molecule that powers nearly every function in the human body. Thiamine is also involved in the metabolism of proteins and fats, making it a critical nutrient for overall energy production and metabolic efficiency.
Because the brain, nervous system, heart, and muscles have particularly high energy demands, they are often among the first organs to be affected when thiamine intake is inadequate.
How vitamin B1 supports energy production
Vitamin B1 contributes to:
- The conversion of carbohydrates into usable energy
- Normal energy-yielding metabolism
- Efficient utilisation of dietary fats and proteins
- Healthy nervous system function
- Cognitive performance and mental clarity
- Physical endurance and vitality
Without sufficient thiamine, the body's ability to generate energy becomes less efficient. As a result, cells may struggle to meet their energy requirements, leading to symptoms that can affect both physical and mental wellbeing.
What happens when vitamin B1 levels are too low?
Suboptimal vitamin B1 status may contribute to a range of symptoms associated with impaired energy metabolism, including:
- Persistent tiredness and fatigue
- Low energy levels
- Reduced physical performance
- Brain fog and difficulty concentrating
- Irritability and mood changes
- Unintentional weight loss
- Reduced appetite
- Impaired immune function
Because these symptoms are common and often attributed to stress, lack of sleep, or a busy lifestyle, low vitamin B1 intake can sometimes go unnoticed.
Individuals who frequently experience unexplained fatigue, poor energy levels, or difficulty maintaining a healthy body weight may benefit from evaluating their overall nutritional status, including their intake of B vitamins. Since vitamin B1 is required daily and cannot be stored in large amounts by the body, consistent intake through food or supplementation is essential for maintaining optimal metabolic function.
At its core, vitamin B1 is an energy nutrient. By supporting the body's ability to convert food into fuel, thiamine helps lay the foundation for vitality, resilience, and long-term health.
Vitamin B1 and the gut-immune connection
When people think about vitamin B1, energy production is usually the first benefit that comes to mind. However, thiamine's influence extends far beyond metabolism. Because every system in the body relies on a steady supply of energy, adequate vitamin B1 levels help support many of the fundamental processes that contribute to overall health and resilience.
One of these processes is digestive function.
The digestive tract does far more than break down food. It serves as one of the body's most important interfaces with the outside world and plays a central role in nutrient absorption, immune regulation, and overall wellbeing. In fact, a significant portion of the immune system is closely associated with the gastrointestinal tract, highlighting the importance of maintaining digestive health.
Vitamin B1 contributes to the normal functioning of muscles throughout the body, including the smooth muscles that line the digestive tract. Healthy muscle tone helps support the movement of food through the digestive system and promotes efficient digestion and nutrient absorption.
Why digestive health matters for vitamin B1 status
The relationship between vitamin B1 and digestive health works both ways.
On one hand, adequate thiamine is needed to support the energy-dependent processes involved in digestion. On the other hand, a healthy digestive system is essential for absorbing vitamin B1 and many other nutrients from food.
Low thiamine levels have been associated with impaired digestive function, including reduced production of hydrochloric acid in the stomach. Stomach acid plays a critical role in breaking down food and preparing nutrients for absorption further along the digestive tract.
When digestion becomes less efficient, the body may struggle to absorb essential vitamins and minerals adequately. Over time, this can create a cycle in which nutritional deficiencies contribute to digestive dysfunction, which in turn increases the risk of additional nutrient deficiencies.
A foundation for overall health
Because vitamin B1 sits at the intersection of energy production, digestive function, and nutrient utilisation, maintaining adequate levels is an important part of supporting whole-body health.
A well-functioning digestive system helps the body absorb the nutrients needed for optimal performance, while sufficient thiamine helps provide the cellular energy required to sustain these processes. Together, they form part of the foundation upon which vitality, resilience, and long-term wellbeing are built.
Vitamin B1 and cognitive health
The human brain accounts for only a small percentage of total body weight, yet it consumes a remarkable amount of the body's energy. To maintain concentration, memory, learning, mood, and overall cognitive performance, the brain relies on a continuous supply of energy and nutrients.
Vitamin B1 plays a crucial role in supporting these processes.
It contributes to normal psychological function and helps the nervous system operate efficiently. It is involved in energy production within brain cells and supports the transmission of signals throughout the nervous system, allowing the brain and body to communicate effectively.
The role of vitamin B1 in the nervous system
One of the most important functions of thiamine is its involvement in maintaining healthy nerve function. Adequate vitamin B1 levels help support the energy-intensive processes required for nerve signalling and neurological performance.
Thiamine also contributes to the maintenance of structures that protect nerve cells and support efficient communication throughout the body. Because the nervous system has particularly high energy demands, it is often among the first systems affected when vitamin B1 intake is insufficient.
For this reason, symptoms of vitamin B1 deficiency may include:
- Brain fog
- Difficulty concentrating
- Memory disturbances
- Mental fatigue
- Irritability
- Reduced cognitive performance
These symptoms highlight the close relationship between nutrition, energy metabolism, and brain health.
Vitamin B1, ageing, and cognitive vitality
Researchers have long been interested in the role of thiamine in healthy cognitive ageing. Emerging evidence suggests that adequate vitamin B1 status may be important for maintaining normal brain function throughout life, particularly because brain cells are highly vulnerable to disruptions in energy production.
Oxidative stress and free radical damage are believed to contribute to age-related cognitive decline. As part of a nutrient-rich diet, vitamin B1 helps support the body's natural physiological processes that promote long-term neurological health and cellular function.
While vitamin B1 is not a treatment for neurodegenerative conditions, maintaining adequate thiamine levels remains an important aspect of supporting overall cognitive wellbeing and healthy ageing.
Nourishing the brain for long-term health
The brain depends on a constant supply of nutrients to perform at its best. Consuming a balanced diet rich in essential vitamins and minerals helps support memory, focus, mental clarity, and neurological resilience throughout life.
At Sanbera, we recognise that optimal health begins at the cellular level. This is why vitamin B1 is included as part of our comprehensive formulations, helping provide the nutritional foundation needed to support energy production, nervous system function, and cognitive health.
When the brain is properly nourished, it is better equipped to support the countless mental and physical processes that shape everyday wellbeing.
How vitamin B1 supports healthy vision
Vision is one of our most valuable senses, allowing us to interact with and interpret the world around us. While the eyes themselves play a critical role in sight, healthy vision depends on a complex network of nerves and communication pathways that connect the eyes to the brain.
Vitamin B1 contributes to the normal functioning of the nervous system, making it an important nutrient for the neurological processes involved in visual perception. Every image we see must be converted into electrical signals and transmitted efficiently to the brain, where those signals are interpreted and transformed into the visual experience we rely on every day.
The link between vitamin B1 and visual function
Thiamine helps support the energy production required by nerve cells throughout the body, including those involved in visual processing. Because both the eyes and the nervous system have high metabolic demands, they rely on a continuous supply of nutrients to function optimally.
Adequate vitamin B1 intake helps support:
- Normal nervous system function
- Efficient communication between the brain and sensory organs
- Cellular energy production
- Overall neurological health
- Healthy ageing and vitality
When nutrient intake is inadequate, the eyes can sometimes reflect these deficiencies through changes in visual comfort and function. This highlights the importance of maintaining a balanced diet rich in essential vitamins and minerals that support both eye health and overall wellbeing.
A nutritional approach to healthy ageing
Long-term eye health depends on a combination of factors, including genetics, lifestyle, environmental influences, and nutrition. A diet rich in antioxidants, essential vitamins, and minerals helps provide the nutrients needed to support healthy tissues throughout the body, including the eyes.
For this reason, Sanbera formulations combine vitamin B1 with other carefully selected nutrients, including vitamins A and E, as part of a comprehensive approach to supporting healthy ageing, cellular protection, and overall health.
By nourishing the body's energy systems, nervous system, and cellular health, vitamin B1 contributes to the strong foundation required for lifelong wellbeing, including the health of the visual system.
Vitamin B1 and mental sharpness
Our ability to learn, focus, remember information, and adapt to new experiences depends on the health of the brain and nervous system. While these processes may feel effortless, they require a constant supply of energy and nutrients to function efficiently.
Vitamin B1 plays an important role in supporting these cognitive processes.
As a key nutrient involved in energy metabolism, thiamine helps provide the fuel required by brain cells to communicate, process information, and maintain normal neurological function. Because the brain is one of the body's most energy-demanding organs, even small disruptions in energy production can affect mental performance and cognitive wellbeing.
The cerebellum and cognitive function
Research has shown that vitamin B1 deficiency can have significant effects on regions of the brain that are highly dependent on energy availability, including the cerebellum.
Traditionally known for its role in movement, coordination, balance, and motor control, the cerebellum is now recognised as an important contributor to several cognitive and emotional functions as well. These include:
- Attention and concentration
- Language processing
- Learning and skill acquisition
- Emotional regulation
- Memory formation
- Coordination and balance
Because these functions rely on efficient communication between nerve cells, maintaining adequate thiamine levels is essential for supporting optimal neurological performance.
Vitamin B1 and memory formation
One particularly fascinating aspect of brain function is procedural memory, sometimes referred to as implicit memory. This form of memory allows us to perform learned skills automatically, often without conscious thought.
Examples include:
- Riding a bicycle
- Swimming
- Driving a car
- Typing on a keyboard
- Playing a musical instrument
These abilities are acquired through repetition and practice, becoming deeply embedded within neural pathways over time. Healthy nerve communication and sufficient cellular energy are fundamental to maintaining these complex processes.
When vitamin B1 levels become inadequate, nerve signalling may become less efficient, potentially contributing to cognitive difficulties, mental fatigue, and neurological symptoms that have historically been observed in severe thiamine deficiency.
Supporting mental performance every day
Mental sharpness is not simply about intelligence; it is about giving the brain the resources it needs to perform consistently throughout life.
Adequate intake of vitamin B1 helps support:
- Normal cognitive function
- Mental clarity and focus
- Memory and learning processes
- Efficient nervous system communication
- Healthy psychological function
- Long-term brain health
When nutritional needs are not met, concentration, productivity, and mental resilience may be affected. This is why a nutrient-rich diet and targeted supplementation can play an important role in supporting cognitive wellbeing, particularly in today's fast-paced environment.
A comprehensive approach to brain health
At Sanbera, we believe that optimal cognitive performance begins with foundational nutrition. Vitamin B1 is therefore combined with other essential nutrients involved in brain and nervous system function, including vitamins B6, B9, and B12.
Together, these nutrients help support the biological processes involved in energy production, neurological communication, and healthy cognitive ageing.
After all, your memories, thoughts, skills, and experiences shape how you understand the world, and ultimately contribute to the person you become. Supporting the brain with the right nutrients today is an investment in mental health for years to come.
Vitamin B1 and heart health
The heart is one of the most hardworking organs in the body. Beating more than 100,000 times each day, it relies on a continuous supply of energy and precise communication between the brain, nervous system, and cardiovascular system to function effectively.
Vitamin B1 plays an important role in both of these processes.
As a key nutrient involved in energy metabolism, thiamine helps the body convert carbohydrates into usable cellular energy. This function is particularly important for the heart, which has exceptionally high energy requirements and must work continuously throughout life.
At the same time, vitamin B1 contributes to the normal functioning of the nervous system. It is involved in the processes that allow signals to travel between the brain and muscles, including the heart muscle itself, helping support coordinated cardiovascular function.
Why the heart needs vitamin B1
The heart depends on a constant supply of energy to maintain its regular rhythm and pumping capacity. Because thiamine is essential for energy production, adequate vitamin B1 levels help support the metabolic processes that enable the cardiovascular system to perform efficiently.
Vitamin B1 contributes to:
- Normal energy-yielding metabolism
- Healthy nervous system function
- Efficient communication between nerves and muscles
- Cellular energy production
- Overall cardiovascular wellbeing
When thiamine intake becomes insufficient, the body's ability to generate energy can be compromised. Since the heart is highly dependent on continuous energy availability, it is particularly sensitive to severe vitamin B1 deficiency.
Historically, some of the most serious forms of thiamine deficiency, including cardiovascular beriberi, have demonstrated the important relationship between vitamin B1 status and heart function.
Vitamin B1 and cardiovascular research
Researchers have long explored the relationship between thiamine status and cardiovascular health. Several studies have observed that individuals with certain heart conditions may have lower thiamine levels than healthy populations, leading scientists to investigate the potential role of vitamin B1 in supporting normal cardiac function.
While ongoing research continues to examine these connections, one conclusion remains clear: maintaining adequate vitamin B1 intake is an important part of supporting the body's energy systems and overall cardiovascular health.
Supporting a healthy heart for the long term
Heart health is influenced by many factors, including nutrition, physical activity, sleep quality, stress management, and lifestyle habits. Among these factors, proper nutrition provides the foundation upon which cardiovascular wellbeing is built.
By supporting energy production and nervous system function, vitamin B1 helps provide the resources required for healthy heart function throughout life.
At Sanbera, we believe that long-term vitality begins with foundational nutrients. This is why vitamin B1 is included in our formulations as part of a comprehensive approach to supporting energy, resilience, cognitive performance, and cardiovascular wellbeing.
A healthy heart never takes a day off, and providing it with the nutrients it depends on is one of the simplest investments you can make in your long-term health.
Who may benefit from vitamin B1 supplementation?
Because vitamin B1 is a water-soluble vitamin, the body stores only limited amounts and requires a regular dietary supply to maintain optimal levels. Unlike fat-soluble vitamins, thiamine is not stored extensively, which makes consistent intake especially important for supporting energy metabolism, nervous system function, and overall wellbeing.
Obtaining sufficient vitamin B1 from food is certainly possible, but modern dietary habits can sometimes make it challenging.
Why vitamin B1 intake may be lower than expected
Many of today's most commonly consumed foods are made from refined grains such as white flour and white rice. During processing, much of the naturally occurring vitamin B1 is removed, leaving these foods with significantly lower thiamine levels than their whole-food counterparts.
In addition, vitamin B1 is sensitive to food preparation methods. Prolonged heating and cooking in large amounts of water can reduce the thiamine content of certain foods, particularly grains and vegetables.
For this reason, individuals who consume relatively few whole grains, legumes, vegetables, nuts, and seeds may be at greater risk of inadequate intake over time.
Who is more likely to need additional vitamin B1?
Certain groups may have increased nutritional requirements or a higher likelihood of developing low thiamine status, including:
- Individuals with highly processed diets
- Older adults
- People who regularly consume excessive amounts of alcohol
- Individuals with digestive or absorption challenges
- Those following restrictive diets
- People experiencing periods of high physical or mental stress
- Individuals with increased metabolic demands
Healthcare professionals may also monitor vitamin B1 status in people with specific medical conditions that can affect nutrient intake, absorption, or utilisation.
Vitamin B1, energy, and modern living
Modern life places considerable demands on the body. Long working hours, high stress levels, irregular eating patterns, intense physical activity, and insufficient recovery can all increase the importance of maintaining adequate nutritional intake.
Because vitamin B1 is essential for converting food into usable energy, it remains one of the foundational nutrients involved in supporting vitality, physical performance, cognitive function, and healthy nervous system activity.
While a balanced diet should always form the foundation of good health, supplementation can be a practical option for individuals who wish to support their daily nutritional intake and help avoid potential gaps in their diet.
Is vitamin B1 supplementation safe?
Vitamin B1 supplementation is generally considered safe when used as directed. Because thiamine is water-soluble, excess amounts are typically excreted by the body rather than stored.
However, as with any dietary supplement, individuals who are pregnant, breastfeeding, taking medication, or managing a medical condition should consult a qualified healthcare professional before beginning supplementation.
Why vitamin B1 is included in every Sanbera formula
At Sanbera, we consider vitamin B1 one of the fundamental nutrients that support human health. Its role in energy production, nervous system function, cognitive wellbeing, and metabolic health makes it an essential component of a comprehensive nutritional foundation.
This is why vitamin B1 is included in every Sanbera formula for women and men.
Our formulations are created using carefully selected vegan ingredients sourced from plants and fruits, reflecting our belief that effective nutrition should work in harmony with both human health and environmental sustainability.
Inspired by Swiss standards of quality, precision, and longevity, we develop supplements designed to support long-term wellbeing while maintaining a commitment to responsible sourcing and a healthier future—for both people and the planet.
After all, optimal health begins with strong foundations, and vitamin B1 remains one of the most important nutrients helping to build them.