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Types of Vitamin B1 (Thiamine): Forms & Bioavailability

Evidence:Strong
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This content is for informational purposes only and does not constitute medical advice. Statements about dietary supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease. Individual results may vary — consult your healthcare provider before starting any supplement. Full disclaimer

Forms Comparison

FormBioavailabilityBest For
Thiamine Hydrochloride (HCl)ModerateGeneral supplementation — standard, well-absorbed water-soluble form
Thiamine MononitrateModerateFood fortification and multivitamins — stable, widely used
BenfotiamineHighDiabetic neuropathy and nerve support — fat-soluble with 5x higher bioavailability than thiamine HCl
SulbutiamineHighCognitive enhancement — crosses blood-brain barrier more effectively

Thiamine Hydrochloride (HCl)

Bioavailability: Moderate. Best for: General supplementation — standard, well-absorbed water-soluble form.

Thiamine Mononitrate

Bioavailability: Moderate. Best for: Food fortification and multivitamins — stable, widely used.

Benfotiamine

Bioavailability: High. Best for: Diabetic neuropathy and nerve support — fat-soluble with 5x higher bioavailability than thiamine HCl.

Sulbutiamine

Bioavailability: High. Best for: Cognitive enhancement — crosses blood-brain barrier more effectively.

Full Vitamin B1 (Thiamine) Guide

References

  1. RCTStracke H, Gaus W, Achenbach U, Federlin K, Bretzel RG (2008). Benfotiamine in diabetic polyneuropathy (BENDIP): results of a randomised, double blind, placebo-controlled clinical study. Experimental and Clinical Endocrinology & Diabetes. DOI PubMed
  2. ReviewWhitfield KC, Bourassa MW, Adamolekun B, et al. (2018). Thiamine deficiency disorders: diagnosis, prevalence, and a roadmap for global control programs. Annals of the New York Academy of Sciences. DOI PubMed
  3. RCTSchoenenberger AW, Schoenenberger-Berzins R, der Maur CA, et al. (2012). Thiamine supplementation in symptomatic chronic heart failure: a randomized, double-blind, placebo-controlled, cross-over pilot study. Clinical Research in Cardiology. DOI PubMed
  4. Turkia M (2020). The History of Methylprednisolone, Ascorbic Acid, Thiamine, and Heparin Protocol and I-MASK+ Ivermectin Protocol for COVID-19.. Cureus. DOI PubMed
  5. RCTManzardo AM, Pendleton T, Poje A, Penick EC, et al. (2015). Change in psychiatric symptomatology after benfotiamine treatment in males is related to lifetime alcoholism severity.. Drug and alcohol dependence. DOI PubMed
  6. Himmerich H, Erbguth F (2014). [Nutrition and dietary supplements in psychiatric diseases].. Der Nervenarzt. DOI PubMed
  7. RCTManzardo AM, He J, Poje A, Penick EC, et al. (2013). Double-blind, randomized placebo-controlled clinical trial of benfotiamine for severe alcohol dependence.. Drug and alcohol dependence. DOI PubMed