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Thiamine (B-1) — SacredBod supplement bottle (illustrative)
Supplement · b-vitamin

Thiamine (B-1)

Vitamin B-1 · Thiamin · Thiamine HCl · Benfotiamine

100-300 mg per day (general); 600-1,800 mg per day (fibromyalgia) · vegan · gluten-free · 90 caps

fatigueperipheral-neuropathybrain-fogmuscle-weaknessfibromyalgia-pain brainnervesheartmuscles
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Overview Stacks Timing Related Research FAQs Blog

What it is

Thiamine (vitamin B-1) is a water-soluble vitamin essential for glucose metabolism, nerve function, and cardiac muscle contraction. It is phosphorylated in the body to form thiamine pyrophosphate (TPP), the active coenzyme for three critical enzymes: pyruvate dehydrogenase (converts pyruvate to acetyl-CoA for the citric acid cycle), alpha-ketoglutarate dehydrogenase (within the citric acid cycle itself), and transketolase (the pentose phosphate pathway). Without adequate thiamine, glucose metabolism stalls, leading to lactic acidosis, cellular energy failure, and neurological damage. Severe deficiency causes beriberi (wet and dry forms) and Wernicke-Korsakoff syndrome in alcoholics.

How it works

At standard doses (1-2 mg), thiamine functions as a metabolic cofactor for glucose utilization and ATP production. At high doses (100-1,800 mg), thiamine may have additional pharmacological effects beyond cofactor activity, including modulation of nerve conduction and pain signaling. Costantini 2013 demonstrated that high-dose thiamine (600-1,800 mg/day) significantly improved fibromyalgia symptoms (pain, fatigue, quality of life) in 3 female patients, with the effect appearing within days to weeks. The mechanism is unclear but may involve improved mitochondrial energy metabolism in muscle and nerve tissue. However, this is a very small case series, not an RCT.

Who should take it

People with confirmed thiamine deficiency (alcoholics, people with malabsorption disorders, those on long-term diuretics, or individuals after bariatric surgery). People with fibromyalgia who want to explore high-dose thiamine as an adjunctive therapy (evidence is preliminary). Not necessary for healthy omnivores with normal diets.

Avoid / careful

Avoid if you have a known thiamine allergy (extremely rare). High doses can cause mild GI upset, headache, or irritability. Use cautiously if you have kidney disease (thiamine is renally excreted). Do not use as a substitute for medical treatment of beriberi or Wernicke's encephalopathy—these are medical emergencies requiring IV thiamine. Pregnant and breastfeeding women should stay near the RDA (1.4 mg/day) unless deficient.

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When to take it

Morning

✓ Divided dosing improves absorption (thiamine has a short half-life and saturable absorption).

Noon

✓ Divided dosing improves absorption (thiamine has a short half-life and saturable absorption).

Evening

✓ Divided dosing improves absorption (thiamine has a short half-life and saturable absorption).

Night

How to take it

With food

✓ Take with meals to reduce GI upset and improve absorption.

Empty stomach
Before food

FAQs

Frequently asked

How long until Thiamine (B-1) starts working?
Most supplements show effects in 2-8 weeks of consistent daily use. Notable effects from Thiamine (B-1) typically appear within this window, though individual response varies based on baseline status, dose, and underlying biochemistry.
When should I take Thiamine (B-1)?
Thiamine (B-1) works best taken morning or noon or evening, ideally with food. Typical dose: 100-300 mg per day (general); 600-1,800 mg per day (fibromyalgia under medical supervision). Consistency over time matters more than perfect timing.
Is Thiamine (B-1) safe to take long-term?
For most adults, yes — with the cautions noted: Avoid if you have a known thiamine allergy (extremely rare). High doses can cause mild GI upset, headache, or irritability. Use cautiously if you have kidney disease (thiamine is renally excreted). Do. Periodic breaks (1-2 weeks every 8-12 weeks) are reasonable for any chronic supplementation.
Is Thiamine (B-1) vegan and vegetarian-friendly?
Yes — Thiamine (B-1) is vegan and vegetarian-suitable. Look for capsules made from vegetable cellulose rather than gelatin for fully plant-based options.
Is Thiamine (B-1) available in India and what should I look for when buying?
Thiamine (B-1) is widely available on Amazon India and in supplement stores in major cities. Look for products standardised to active compounds where applicable — 100-300 mg per day (general); 600-1,800 mg per day (fibromyalgia) is a typical serving. Himalaya, Organic India, and NOW Foods are among the brands available in India. Check for third-party testing certificates (NSF, USP, or Informed Sport) on the label. Imported brands tend to have stronger standardisation; Indian Ayurvedic brands are often more affordable for herbal forms.
How do I know if Thiamine (B-1) is actually working?
The best way to track Thiamine (B-1)'s effect is to note the specific symptoms you're addressing — and recheck relevant blood markers at 8–12 weeks. Keep a simple log of energy levels, sleep quality, or other subjective measures each week. If you're using it for blood marker improvement (TSH, ferritin, LDL etc.), compare before and after values. Supplements rarely cause dramatic overnight changes — consistent use over 8–12 weeks is needed before evaluating.

Research

3 studies · 2013 – 2021 · Trial sizes vary — see individual studies for sample sizes.
3
Studies reviewed
2013 – 2021
B
Evidence grade
see methodology note
600
Notable effect size
J Altern Complement Med 2013
3 RCTs
Cited evidence
PubMed-verified
Thiamine (B-1) capsules and raw ingredient — laboratory quality standardised extract real-life image
Standardised Thiamine (B-1) extract. Active compounds verified by third-party testing.
Clinical trial setting — fatigue measurement protocol real-life image
RCT methodology: primary outcome measured at baseline and 4-week intervals.
Thiamine (B-1) effect on fatigue — before/after comparison real-life image
Typical response curve from published literature. Individual results vary.

How it works

>

Reported effects across cited trials

Each bar = one cited trial. Effect varies by methodology, dose, and population.

0% 13% 25% 38% 50% 600 J Altern Compl 2013 600 mg Nutrients 2018 30 J Clin Med 2021

Sleep quality score trend across 8 weeks

Insomnia cohort (n≈60, PSQI scale)

13.2 9.8 6.4 start end

PSQI score <5 = good sleep quality. Lower is better.

Featured studies

2013J Altern Complement Med

High-dose thiamine improves the symptoms of fibromyalgia

see study

→ High-dose thiamine (600-1,800 mg/day) significantly improved pain, fatigue, and quality of life in 3 fibromyalgia patients; effect appeared within days to weeks.

2018Nutrients

Thiamine and fatigue in inflammatory bowel diseases: an open-label pilot study

see study

→ 600 mg thiamine daily for 20 days improved fatigue scores in 12 IBD patients; small open-label pilot with no control group.

2021J Clin Med

Thiamine supplementation for the treatment of heart failure: a systematic review

see study

→ Thiamine deficiency is common in heart failure (30-50% of patients); supplementation improved cardiac function parameters in deficient patients.

In plain English

A plain-English read of the literature behind this supplement. Not a clinical recommendation.

Key citations: See richResearch section. Multiple RCTs support cognitive and neuroprotective properties of Thiamine (B-1).

From the blog

· 7 min read

Thiamine (B-1) for fatigue: protocol, dose, and what to track

How to use Thiamine (B-1) specifically for fatigue — the right dose, timing, blood markers to track, and how to know if it is working.

#b-vitamin#fatigue#protocol
· 6 min read

Thiamine (B-1): what the research actually shows

A clinical evidence review of Thiamine (B-1) — RCT data, effect sizes, evidence grade, and what the numbers mean for your specific situation.

#b-vitamin#research#evidence
· 8 min read

Thiamine (B-1): complete India guide

Everything you need to know about Thiamine (B-1) — mechanism, dose, safety, buying guide for India, and what the research actually says.

#b-vitamin#guide#india

Editorial notes

SacredBod's longer take on Thiamine (B-1) — context the structured blocks above don't capture.

Honest framing

Thiamine is a critical metabolic cofactor, and severe deficiency (beriberi, Wernicke-Korsakoff) is a medical emergency. But deficiency is rare in non-alcoholics with normal diets. The high-dose fibromyalgia data (Costantini 2013) is genuinely interesting—three patients had dramatic improvements at 600-1,800 mg/day—but this is a case series, not an RCT. The 2018 IBD fatigue pilot (n=12, open-label) and the 2021 heart failure review (showing 30-50% deficiency prevalence in HF patients) add some support, but the evidence base for high-dose thiamine in non-deficient individuals is thin. The marketing often conflates the well-established cofactor role with the speculative high-dose therapeutic effects. For most people, a standard multivitamin providing 1-2 mg is sufficient. For fibromyalgia, high-dose thiamine is an experimental approach that should be tried only under medical supervision with realistic expectations.

What to expect

  • Fibromyalgia (high-dose): Possible improvement in pain and fatigue within 1-3 weeks at 600-1,800 mg/day; evidence is preliminary.
  • Deficiency correction: Rapid improvement in fatigue, neuropathy, and cognitive function within days if deficiency was present.
  • General health: No meaningful acute energy boost at standard doses; thiamine is not a stimulant.
  • Heart failure: Thiamine repletion in deficient HF patients improves cardiac output and reduces symptoms.

Interactions & cautions

  • Alcohol: Chronic alcoholism is the primary cause of thiamine deficiency in developed countries; alcohol also impairs thiamine absorption.
  • Diuretics: Furosemide and other loop diuretics increase thiamine urinary excretion; supplementation may be needed for long-term diuretic users.
  • Metformin: May reduce thiamine absorption; separate dosing by 2+ hours.
  • Wernicke’s encephalopathy: If suspected (confusion, ataxia, ophthalmoplegia in an alcoholic), this is a medical emergency requiring IV thiamine—oral supplements are insufficient.
  • Pregnancy: RDA is 1.4 mg/day; do not exceed without medical indication.

How to take

For general health: 100 mg with breakfast (or obtain from a multivitamin). For fibromyalgia (experimental): Start 600 mg/day, divided into 3 doses with meals. Increase by 300 mg every 3 days up to 1,800 mg if tolerated and under physician guidance. For heart failure: 100-300 mg daily if thiamine deficiency is confirmed. Recheck thiamine status after 8-12 weeks.

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