Thiamine
Content by: OpenSupplement Editorial Team | Medical review: pending | Last updated: April 13, 2026
TL;DR
Vitamin B1, essential for glucose metabolism and nerve energy
Low evidence for cognitive decline (outside of deficiency)
Benfotiamine is the superior fat-soluble form for nerve protection
Critical for heavy alcohol users and those with high sugar intake
Excellent safety profile
Cost: ~$5-10/month
Best for: Diabetic neuropathy support, alcohol recovery, metabolic health
What it is
Thiamine was the first B-vitamin discovered. It is the 'spark plug' of the cell, required to turn sugar into energy. The brain and nerves are incredibly sensitive to thiamine deficiency because they are so energy-hungry.
Modern diets high in refined sugar and alcohol 'burn through' thiamine rapidly. Benfotiamine is a special, fat-soluble form of thiamine that reaches the nerves much better than standard B1, making it a favorite for treating nerve damage.
What the research says
Severe B1 deficiency causes 'Korsakoff Syndrome' (severe memory loss). Evidence. Some research suggests that mild, chronic B1 deficiency may contribute to Alzheimer's, as Alzheimer's brains show reduced thiamine-dependent enzyme activity. Benfotiamine Trial. A small trial showed that Benfotiamine improved cognitive scores in MCI patients over 12 months. It's a promising 'niche' brain supplement. [1][2]
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Thiamine on Amazon
Safety
Extremely safe. There is no known toxicity level for thiamine. It is well-tolerated even at high doses.
Interactions
None significant. It is very safe to take with other medications.
Dosing
Standard Dose: 100-300 mg daily. Form: Use Benfotiamine for better nerve and brain penetration.
Cost
Cheap. $5-10 per month.
The bottom line
If you eat a lot of sugar, drink alcohol regularly, or have nerve pain, thiamine (specifically Benfotiamine) is an essential metabolic 'safety net.'
References
- Office of Dietary Supplements - Thiamin. National Institutes of Health.
- Stracke H, Gaus W, Achenbach U, et al. Benfotiamine in diabetic polyneuropathy (BENDIP): results of a randomised, double blind, placebo-controlled clinical study. Exp Clin Endocrinol Diabetes. 2008;116(10):600-605.
Sources for this page include published meta-analyses, systematic reviews, and NIH dietary supplement fact sheets. All claims reflect the evidence as of early 2026.
This is not medical advice. Consult your healthcare provider before starting any supplement, especially if you take medications.