Vitamin B1 (Thiamin), 400 mg 100 capsules

Dr. Clark Store SKU: 10444-100
Dr. Clark Store Vitamin B1, 400 mg 100 capsules
Dr. Clark Store Vitamin B1 supplement facts
Dr. Clark Store products are chemically pure, solvent free and additive free.
Dr. Clark Store products are tested for microbiology, heavy metals, and identity. We also test products for certain toxins using Dr. Clark’s biofeedback device called a Syncrometer.
Dr. Clark Store products are manufactured without flow agents like magnesium stearate, which interfere with nutrient absorption.
Gelatin capsules are a purer alternative to “veggie” capsules, which are made from tree pulp and chemicals. Our BSE and TSE free gelatin capsules are made with gelatin from cattle hide – never from bones.
Dr. Clark Store products are high quality, chemically pure, and made in GMP verified facility.

Vitamin B1 (Thiamin), 400 mg 100 capsules

Dr. Clark Store SKU: 10444-100
Regular price $21.99
Shipping calculated at checkout.
Only 386 items in stock!
  • The Original Dr. Hulda Clark Products
  • Leader in Purity Since 1993
  • Certified and Audited GMP
  • Helps maintain energy level*
  • Supports nervous system function*
  • Promotes proper heart function*

Vitamin B1, also known as thiamine, was one of the first organic compounds to be recognized as a vitamin. Like all the other B complex vitamins, it is water soluble and not stored in the body. Rather, excess amounts of B1 will be excreted. And like the other B vitamins, it helps the body convert the foods we eat into usable fuel to maintain life-sustaining functions.

Vitamin B1 must be in adequate supply for aerobic energy production to take place. This is the process in which sugar (glucose) is converted into usable energy.

Vitamin B1 also plays roles in the nervous system. It promotes the healthy development of myelin sheaths, the material that surrounds and protects most nerves. Insufficient vitamin B1 intake can result in degradation and damage to the myelin sheath. Symptoms such as pain, prickly sensation, and deadened nerves may be linked to a vitamin B1 deficiency.*

Thiamine is needed for the production of acetylcholine, a neurotransmitter that relays messages between the nerves and the muscles. Acetylcholine’s importance in maintaining muscle tone makes vitamin B1 a significant nutrient in maintaining proper heart function because the heart is a muscle whose performance is vital to human life.*

Absorption of vitamin B1 requires sufficient supplies of vitamin B6, B12, and folic acid.


Vitamin B1 (as thiamine hydrochloride), gelatin (bovine) capsule

Suggested Use
Adults and children 12 years or over, take 1 capsule daily with a meal or as directed by a healthcare professional.

Store at room temperature. Keep out of reach of children.


Frequently Asked Questions
Q: What is the capsule size?
A: Capsule size 00.

Q: What type of capsule does this product come in?
A: This comes in a gelatin capsule. The gelatin is derived from bovine hide (beef skin).

Related Articles: Vitamin B Fact Sheet

*Disclaimer: These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any diseases. As with any dietary supplement, you should consult with a qualified healthcare professional if you are pregnant or nursing, if you have any medical condition, or if you are taking any medication before using this product. Always consult with a healthcare professional before giving supplements to children. Please read full disclaimer here.
Coupon (discount) codes are not applicable on product subscriptions. The subscription price is already discounted from the one time purchase price.


All orders are shipped directly from our factory warehouse in Chula Vista, California. Orders received before 12PM Pacific Time ship the same day (excluding weekends and holidays). Orders received after 12PM Monday-Friday will ship the following business day. Your tracking number will be emailed from as soon as your order is shipped. 

For international shipments, duties and taxes may be applicable. By ordering from this website, you acknowledge that it is your responsibility to pay any duties and taxes.

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You can return any unopened or unused product within 30 days on the date on your invoice. Simply send the item back with a copy of your invoice. If you are unhappy with any consumable product, you may return an open item for a refund as long as at least 50% of the original contents remain and the return is done within 30 days of the date on your invoice.  

Please report any overages, shortages, or damages within 10 days of receiving your order.

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