Benfotiamine

vitamin

What is it

Benfotiamine is a lipid-soluble derivative of vitamin B1 (thiamine) with significantly higher bioavailability and tissue penetration than water-soluble thiamine forms. It is widely used for diabetic complications and other applications requiring elevated tissue thiamine levels.

How it works

Unlike water-soluble thiamine (HCl or mononitrate), benfotiamine's lipophilic nature allows it to passively diffuse across the intestinal wall and into cells more readily. Once absorbed, it is converted to thiamine and then to the active coenzyme thiamine diphosphate (TDP). Benfotiamine achieves blood and tissue thiamine levels approximately 5-fold higher than equivalent doses of water-soluble thiamine. The higher tissue thiamine levels achieved by benfotiamine activate transketolase, an enzyme that can divert excess glucose-derived metabolic intermediates away from harmful pathways. These pathways (advanced glycation end-products, hexosamine, protein kinase C activation, polyol pathway) contribute to diabetic complications. By activating transketolase, benfotiamine may reduce diabetic nerve and vascular damage. Benfotiamine has been studied primarily for diabetic neuropathy and other diabetic complications, with most evidence coming from German clinical research. It is also used for alcoholic neuropathy and certain neurological conditions where higher tissue thiamine is desired.

Evidence for 6 uses

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

Diabetic peripheral neuropathy

Grade B

Good evidence

Multiple clinical trials, primarily from Germany, suggest benfotiamine at 300 to 600 mg per day reduces pain and improves nerve function in diabetic peripheral neuropathy. Effects develop over weeks to months. Considered a meaningful adjunctive option.

Diabetic nephropathy

Grade C

Moderate evidence

Some clinical research suggests benfotiamine may slow albumin excretion in diabetic kidney disease. Evidence is moderate; results vary.

Diabetic retinopathy

Grade C

Moderate evidence

Some research suggests benfotiamine may reduce markers of retinal microvascular damage in diabetes. Direct clinical outcomes are less well established.

Alcoholic neuropathy

Grade C

Moderate evidence

Some studies suggest benfotiamine may improve symptoms of alcohol-related neuropathy. Severe deficiency may require parenteral thiamine initially.

Advanced glycation end-products (AGEs) reduction

Grade C

Moderate evidence

Some research suggests benfotiamine may reduce AGE formation in diabetes through transketolase activation. Clinical translation to specific outcomes is limited.

Alzheimer's disease

Grade D

Mixed evidence

Mechanistic interest exists based on reduced brain glucose metabolism in Alzheimer's, but clinical evidence for benfotiamine as a treatment is limited.

3 commercial forms

Benfotiamine (S-benzoylthiamine O-monophosphate)

Lipid-soluble derivative; substantially higher bioavailability than water-soluble thiamine.

Standard supplement form. Look for products specifying benfotiamine content.

Benfotiamine + B-complex combinations

Combined with other B vitamins (B6, B12, folate) for broader neurological support.

Common in diabetic neuropathy formulas.

Benfotiamine + alpha-lipoic acid

Pairs neuropathy-supportive compounds.

Often used in diabetic neuropathy formulations.

Dosage

Typical doses range from 150 to 600 mg per day, often split into 2 to 3 administrations. Most clinical studies for diabetic neuropathy have used 300 to 600 mg per day. Effects develop over weeks to months. There is no established Tolerable Upper Intake Level.

When and how to take it

WHEN: Take benfotiamine at any time of day. Splitting daily doses (e.g., morning and evening) supports steady tissue levels. HOW: Take with food, especially fat-containing meals, as the lipid-soluble nature is best supported by dietary fat. Allow 4 to 12 weeks for effects on chronic conditions like diabetic neuropathy.

Food sources

Food	Amount	%DV
Benfotiamine is not naturally found in foods in significant amounts; obtain through supplementation.	N/A	—
Roasted garlic (contains related allithiamine compounds)	Various	—

Safety

Benfotiamine is generally very well tolerated. Side effects are uncommon and mild, including occasional GI upset and headache. There is no established Tolerable Upper Intake Level. Long-term safety appears acceptable in available research extending to a year or more.

Who should be cautious

Pregnant and breastfeeding women should consult a clinician due to limited specific safety data for benfotiamine (versus food-source thiamine). People with chronic alcohol use disorder benefit from thiamine supplementation; benfotiamine is an option but parenteral thiamine may be needed for severe deficiency. People with serious liver or kidney disease should consult a clinician.

Interactions

Few clinically significant drug interactions are documented. Like other thiamine forms, may interact with loop diuretics that increase thiamine excretion. May enhance effects of diabetes medications by improving glucose-related complications, though it does not lower blood glucose directly.

Frequently asked questions

How is benfotiamine different from regular thiamine?⌄

Benfotiamine is lipid-soluble and achieves blood and tissue thiamine levels approximately 5-fold higher than equivalent oral doses of water-soluble thiamine. This makes it more effective for conditions requiring elevated tissue thiamine, particularly diabetic complications.

Is benfotiamine effective for diabetic neuropathy?⌄

Yes. Multiple clinical trials, primarily German research, support 300 to 600 mg per day for reducing pain and improving nerve function in diabetic neuropathy. Effects develop over weeks to months.

Does benfotiamine lower blood sugar?⌄

No. Benfotiamine does not lower blood glucose directly. It works by reducing glucose-driven damage pathways in tissues, not by changing glucose levels. Continue diabetes management as prescribed.

How long should I take benfotiamine?⌄

For chronic conditions like diabetic neuropathy, benfotiamine is typically used long-term, with effects evaluated every 3 to 6 months. Long-term safety is acceptable based on available research.

Can I take benfotiamine with other B vitamins?⌄

Yes. Benfotiamine is often combined with B6, B12, and folate in formulations for nerve health. The combination is well tolerated.

References

Wikidata: Benfotiamine — Wikidata link
PubChem: Benfotiamine (CID 3032771) — PubChem link

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Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you're pregnant, breastfeeding, on medications, or managing a chronic condition.