Douglas Laboratories B-12

8 reviews

Selection: 100 Tablets
Sale price$12.20

- Free shipping on U.S. orders over $39
- 45 Day Return Policy


  • Douglas Laboratories Vitamin B12 tablets supply 500 mcg of Vitamin B-12 in each easy to swallow tablet. 
  • Vitamin B12 is essential for normal energy metabolism of carbohydrates, fat and protein. As a cofactor for methylmalonyl-CoA mutase enzymes, vitamin B12 helps convert odd chain fatty acids and branched chain amino acids into succinyl-CoA, a common citric acid cycle intermediate.
  • Vitamin B12 is also required for nucleic acid (DNA) synthesis, methionine synthesis from cysteine, and normal myelin synthesis in the nervous system. Along with vitamin B6 and folic acid, adequate levels of vitamin B12 are required to maintain normal plasma homocysteine levels. Elevated plasma homocysteine may be an independent risk factor for developing heart conditions. 
  • There are two distinct mechanisms for intestinal vitamin B12 absorption; receptor-mediated absorption and passive diffusion. In the first, vitamin B12 attaches to a salivary R-binder protein which transports it into the small intestine, where vitamin B12 is released. The vitamin then binds to Intrinsic Factor (IF), a glycoprotein normally produced by the gastric parietal cells.
  • This vitamin B12-IF complex is carried down to the ileum, where it binds to mucosal receptors. Finally, the complex is absorbed and bound to serum vitamin B12-binding proteins. The second absorption mechanism, passive diffusion, does not require any carriers, such as B-binder or IF. The elderly and strict vegetarians are often at risk for vitamin B12 deficiency, either due to low dietary intake or impaired absorption.


Serving Size 1 tablet

Amount Per Serving ......  %DY

Vitamin B-12 .......... 500 mcg ..... 8,333%


Other Ingredients:

Cellulose, vegetable stearate and silica.

Suggested Use:

Adults take 1 tablet daily with meals or as directed by a healthcare professional.

Side Effects:

No adverse side effects have been reported.


Store in a cool, dry place, away from direct light. Keep out of reach of children.

*These statements have not been evaluated by the U.S. Food and Drug Administration. This product is not intended to treat, mitigate, diagnose or cure any disease.

Customer Reviews

Based on 8 reviews
LaDonna W.

Douglas Laboratories B-12

Pete N.

Recommended by my healthcare professional

John P.
B-12 It Works!

Tried several, but this one works and it will not disintegrate in the container like some of the others.

Great Product

I started this product after having a reaction to one provided to me by the VA. I am very pleased with the product.

Kim F.
Always affordable and on time.

Our experience with you is always great

Recently viewed