Vitamin B1 (Thiamine): Benefits for Energy & Nerves

[ 01 ] Key Facts

Dose in element³	RISE (AM Formula): 1.1mg
Form	Thiamine hydrochloride — stable, well-absorbed form
Signs you may need more	Low energy despite adequate food intake, poor concentration, irritability, muscle weakness
Safe range	1.1mg daily for adult women; no established upper intake level (water-soluble, excess is excreted). Higher doses used therapeutically without adverse effects.

Food sources

Whole grains
Pork
Black beans
Sunflower seeds

[ 02 ] Rationale

Why this ingredient is in element³

Thiamine occupies a unique position in energy metabolism: it is the gatekeeper of the first step. Before your body can convert the food you eat into ATP — the energy currency that powers every cell — thiamine must act as a coenzyme for pyruvate dehydrogenase, the enzyme that channels glucose into the mitochondrial energy cycle. Without sufficient thiamine, this process stalls, and energy production becomes inefficient regardless of how well you eat.

This is not a theoretical concern. Subclinical thiamine deficiency is more common than most people realise, particularly among women who consume alcohol regularly, follow restrictive diets, or rely heavily on processed foods (which have had much of their natural thiamine removed). The symptoms — fatigue, brain fog, irritability, and difficulty concentrating — are non-specific enough to be attributed to dozens of other causes, which means thiamine insufficiency often goes unrecognised.

Beyond energy metabolism, thiamine is essential for nerve function. It supports the synthesis of acetylcholine, a neurotransmitter critical for memory, attention, and muscle control. It also maintains the myelin sheaths that insulate nerve fibres, ensuring rapid and accurate signal transmission throughout the brain and peripheral nervous system.

Within the RISE formula, thiamine forms the first link in a complete B-vitamin energy chain. B2 (riboflavin) and B3 (niacin) serve as cofactors at subsequent steps in the electron transport chain. B5 (pantothenic acid) synthesises coenzyme A, the molecule that carries acetyl groups into the mitochondrial citric acid cycle. Together, these B vitamins ensure that every stage of energy conversion is adequately supported — not just the first step.

At 1.1mg, RISE delivers the full RDI as a reliable daily foundation. As a water-soluble vitamin, thiamine cannot be stored in meaningful quantities, which makes consistent daily intake essential.

[ 03 ] At 35+

Relevant at 35+

Energy metabolism efficiency declines with age, and thiamine’s role becomes more critical as the body’s mitochondrial function diminishes. After 35, mitochondrial output naturally decreases, which means the enzymatic pathways that thiamine supports need to work at peak efficiency to compensate. Any shortfall in thiamine translates directly to reduced ATP production — experienced as the persistent, low-grade fatigue that many women in their late 30s and 40s accept as normal.

The hormonal shifts of perimenopause add further complexity. Cortisol dysregulation from HPA axis stress increases the body’s metabolic demands while simultaneously impairing nutrient absorption. Elevated cortisol also increases the brain’s glucose consumption, placing greater demand on the thiamine-dependent pathways that convert glucose into usable energy. Brain fog, difficulty concentrating, and mental fatigue are common consequences when this pathway is undersupplied.

Thiamine’s nervous system support is equally relevant during this transition. The mood regulation challenges that accompany perimenopause — irritability, anxiety, and emotional volatility — are influenced by neurotransmitter balance, and thiamine’s role in acetylcholine synthesis means it contributes to the neurological stability that helps women navigate this period with greater cognitive resilience.

[ 04 ] Your Questions

Your Questions

What is vitamin B1?

Vitamin B1, also known as thiamine, is a water-soluble B vitamin that plays a foundational role in energy metabolism. It is essential for converting carbohydrates, fats, and proteins into ATP — the energy currency cells use to function. Thiamine is also critical for nerve function: it is required for the synthesis of acetylcholine (a key neurotransmitter) and for maintaining the myelin sheaths that protect nerve fibres. Unlike fat-soluble vitamins, thiamine is not stored in the body in significant amounts, meaning consistent daily intake is essential.

What does vitamin B1 thiamine do?

Thiamine converts carbohydrates into ATP energy by acting as a coenzyme for pyruvate dehydrogenase, the enzyme that channels glucose into mitochondrial energy production. It also supports nerve function and neurotransmitter synthesis, particularly acetylcholine for memory and attention. thiamine deficiency symptoms in women Subclinical thiamine deficiency can cause persistent fatigue, difficulty concentrating, irritability, poor short-term memory, and muscle weakness. These symptoms are often attributed to stress or hormonal changes rather than nutrient insufficiency.

What are the benefits of taking vitamin B1?

Thiamine supplementation supports sustained energy production from food, nervous system health, and cognitive function. Research has shown benefits for reducing fatigue, improving mood stability, and supporting the neurological function that underlies concentration and mental clarity. It also plays a specific role in carbohydrate metabolism — without adequate thiamine, pyruvate (a glucose breakdown product) cannot be properly converted to acetyl-CoA for use in the mitochondrial energy cycle, leading to a metabolic energy bottleneck.

How much vitamin B1 do adults need?

The recommended dietary intake for adult women is 1.1mg per day. Thiamine is water-soluble and cannot be stored in significant amounts, so consistent daily intake is important. element³ RISE provides the full 1.1mg RDI.

Does thiamine help with energy and fatigue?

Yes. Thiamine is essential for the first step of converting food into cellular energy (ATP). Research indicates that inadequate thiamine intake impairs energy metabolism and contributes to fatigue, even before clinical deficiency develops. vitamin B1 for brain fog and concentration Thiamine supports brain energy metabolism (the brain consumes approximately 20% of the body’s glucose) and the synthesis of acetylcholine, a neurotransmitter critical for attention and memory. Ensuring adequate thiamine intake may help support mental clarity and focus.

Can you take too much vitamin B1?

Thiamine has no established upper intake level because it is water-soluble — excess is excreted by the kidneys rather than accumulated. Therapeutic doses well above the RDI have been used in clinical settings without adverse effects.

What are the benefits of vitamin B1 in the element³ protocol?

In element³ RISE, vitamin B1 at 1.1mg is part of the complete active B vitamin complex that collectively supports the energy, neurological, and mitochondrial function benefits of the formula. Thiamine works in sequence with B2, B3, and B5 through the energy metabolism cascade — each is required at a different step for the complete conversion of food into usable ATP. Without B1, the entire energy chain stalls at an early step. In the RISE formula, the full B complex ensures no single vitamin becomes the limiting factor in energy production.

What form of vitamin B1 is in the element³ blend?

element³ RISE uses thiamine hydrochloride — the most commonly used and well-studied form of thiamine in supplements and clinical research. It is stable, water-soluble, and well-absorbed in the gut. While alternative forms like thiamine mononitrate and benfotiamine (a fat-soluble thiamine derivative with enhanced bioavailability) exist, thiamine hydrochloride is the standard reference form with the most extensive safety and efficacy data, making it the appropriate choice for a daily multi-ingredient formula at RDI dosing.

What is the recommended daily intake of vitamin B1?

The recommended dietary intake for adult women is 1.1mg per day. element³ RISE provides 1.1mg per serve — exactly meeting the RDI. Thiamine is water-soluble with no established upper intake level, meaning excess is excreted in urine without accumulation. Higher therapeutic doses (50–100mg) are used in clinical settings for specific conditions, but the 1.1mg in RISE is designed for baseline support within a comprehensive daily formula rather than therapeutic correction.

What food provides vitamin B1?

Thiamine is found in whole grains (particularly wheat germ and enriched grains), pork, black beans, lentils, sunflower seeds, and nutritional yeast. Notably, thiamine is water-soluble and heat-sensitive, meaning significant amounts are lost in cooking, processing, and food storage. White rice and refined flour have had much of their thiamine removed, which is why enrichment programs add it back. Women eating a diet high in refined carbohydrates and low in whole grains may have lower thiamine intake than food tables suggest.

What are vitamin B1 deficiency symptoms?

Thiamine deficiency symptoms include low energy despite adequate food intake, poor concentration, irritability, muscle weakness, and in moderate deficiency, peripheral tingling or numbness. Severe deficiency causes beriberi (neurological and cardiovascular damage) or Wernicke’s encephalopathy, though these are rare in developed countries. Subclinical thiamine insufficiency is more common and often presents as persistent fatigue, cognitive sluggishness, and reduced stress resilience — symptoms that overlap with other B vitamin insufficiencies.

[ 05 ] The Research

1 study

The Research

Study	Key finding	Why it's here	Read
The effects of vitamin B1 on ameliorating the premenstrual syndrome symptomsAbdollahifard, S., Rahmanian Koshkaki, A., & Moazamiyanfar, R. (2014). The effects of vitamin B1 on ameliorating the premenstrual syndrome symptoms. Global Journal of Health Science, 6(6), 144–153.	Vitamin B1 (thiamine) supplementation significantly reduced both mental symptoms (by 35%) and physical symptoms (by 21%) of premenstrual syndrome compared to placebo in a double-blind randomised controlled trial.		Read →

[ 06 ] In the Protocol

Where Vitamin B1 (as Thiamine Hydrochloride) sits in the element³ Protocol

In RISE (AM Formula), Vitamin B1 at 1.1mg as thiamine hydrochloride supports the first and rate-limiting step of mitochondrial energy production, converting dietary carbohydrates into acetyl-CoA for ATP synthesis. It works as the opening link in RISE’s complete B-vitamin energy chain — B2 (electron transport), B3 (NAD+ synthesis), B5 (coenzyme A production) — ensuring that every stage of cellular energy conversion is supported. Thiamine’s additional role in nerve signalling and acetylcholine synthesis supports the mental clarity and cognitive resilience that women need throughout the day. Taken in the morning, it sets the metabolic foundation for sustained energy.

You can learn more about the full element³ ingredient philosophy at element3.co.nz.

Vitamin B1 (as Thiamine Hydrochloride)