Niacin 500, 500 mg, 100 capsules

Dr. Clark Store SKU: 10545-100
Dr. Clark Store Niacin 500, 500 mg, 100 capsules
Dr. Clark Store Niacin 500 suggested use
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.

Niacin 500, 500 mg, 100 capsules

Dr. Clark Store SKU: 10545-100
Regular price $21.49
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  • The Original Dr. Hulda Clark Products
  • Leader in Purity Since 1993
  • Certified and Audited GMP
  • Promotes energy production*
  • Supports the nervous and circulatory systems*
  • Aids in healthy digestion*

Use caution when taking niacin in high doses. Niacin is a vasodilator, meaning it opens up the capillaries and allows increased blood flow to the skin. This causes the characteristic “niacin flush” with symptoms that can include reddening of the skin, increased warmth, skin tingling, and itching. It usually starts at the forehead and works its way down the body. The niacin flush is harmless and will pass, but this can be uncomfortable for some people.

High dose niacin is not recommended for first-time niacin users. If you flush with low dose niacin, you can expect a more intense and prolonged flush if you jump to a high dosage without a gradual build up. To avoid an intense flush, start with a low dose niacin such as our 25 mg Niacin. If this low dose makes you flush, open a capsule and take only a portion of the niacin power and gradually increase the amount of powder in each dose. Continue gradually increasing your niacin dose if working up to higher doses of niacin. Each time niacin is taken, the flush is repeated but to a lesser degree.*

Why high-dose Niacin?
Abram Hoffer, MD, PhD was a pioneering niacin researcher who advocated the use of nutrition-based medicine, including regular, prolonged therapeutic doses of niacin, for the prevention and treatment of a wide spectrum of health problems.*

In a book co-authored by Dr. Hoffer, Niacin: The Real Story, researchers challenged the Safe Upper Limit (UL) of niacin set forth by the Institute of Medicine, which is currently 35 mg per day for adults. Hoffer and his associates debated the legitimacy of the government standard UL when, to date, there is no evidence to prove that high doses of niacin are harmful to human health.*

Dr. Hoffer’s standard therapeutic niacin recommendation was 3,000 mg per day divided into three doses. He recommended taking niacin with a meal for improved absorption.*

Niacin (Vitamin B3) helps the body utilize proteins, fats and carbohydrates for energy, and also supports nerve and skin health. Niacin may help the body’s efforts to lower cholesterol and supports digestive health.*

How to work yourself up to 3,000 mg of pure Niacin per day:
You may be wondering how to build up to 3,000 mg of pure niacin per day, as described by Dr. Abram Hoffer in Niacin: The Real Story.

You may not know that time released niacin, which is designed to limit the effects of flushing, has been found to be toxic to the kidneys, so it should be avoided. Take only pure niacin.*

Keep in mind that niacinamide is an option, although not as potent as pure niacin, for those who cannot tolerate the niacin flush. When taking pure niacin you may experience flushing from the top of your head down to your lower back. This is a harmless reaction but you may want to limit the intensity of the flush by starting with small amounts of niacin.

For example, start with 25 mg and keep taking this amount until you are comfortable with the effects of the flush. Then increase to 50 mg (this may be possible by the third dose). Increase dose to 100 mg, 200 mg, 500 mg and eventually 1,000 mg per dose, three times a day, using a similar wait time between each increase. You can go slower or faster depending on your comfort level.

Always talk to a qualified healthcare professional prior to taking vitamins and supplements in high doses, as discussed here.


Niacin, gelatin (bovine) capsule

Suggested Use
Adults take 1 capsule daily, preferably with a meal, or as directed by a healthcare professional. Consult with a physician before administering to children.

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


Frequently Asked Questions
Q: What is the capsule size?
A: Capsule size 0.

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).

Q: What is the difference between niacin and niacinamide?
A: The difference between niacin and niacinamide lies in the chemical composition of each form of vitamin B3. While niacin contains an organic acid group, niacinamide contains an amino group. This difference in composition allows each form of B3 to carry out specific tasks in the body. For some purposes, however, the two forms can be used interchangeably. The body can convert niacin into niacinamide with help from the amino acid tryptophan.

Q: Will this product cause skin flushing?
A: Niacin causes capillaries to dilate, which allows more blood flow to the skin. For some people, this causes a "niacin flush" with symptoms that include reddening of the skin, increased warmth, tingling, and itching. The flush typically starts at the forehead and works its way down the body. The niacin flush is harmless and will pass but may cause minor discomfort for people. If you're concerned about flushing, try niacinamide instead.


*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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