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2. Here’s What You Need to Know About B-Complex Vitamins - AOL

   www.aol.com/know-b-complex-vitamins-184200741.html

   “Like vitamin C, B-complex vitamins are water-soluble. As a result, they cannot be stored for later use. The body will use what it needs, and the rest is excreted as waste in the urine.”

3. B vitamins - Wikipedia

   en.wikipedia.org/wiki/B_vitamins

   Dietary supplements containing all eight are referred to as a vitamin B complex. Individual B vitamins are referred to by B-number or by chemical name, such as B 1 for thiamine , B 2 for riboflavin , and B 3 for niacin , [ 1 ] [ 2 ] while some are more commonly recognized by name than by number, such as pantothenic acid (B 5 ), biotin (B 7 ...

4. Vitamin B3 - Wikipedia

   en.wikipedia.org/wiki/Vitamin_B3

   Vitamin B 3, colloquially referred to as niacin, is a vitamin family that includes three forms, or vitamers: nicotinic acid (niacin), nicotinamide (niacinamide), and nicotinamide riboside. [ 1 ] [ 2 ] All three forms of vitamin B 3 are converted within the body to nicotinamide adenine dinucleotide (NAD).

5. Vitamin B12 deficiency - Wikipedia

   en.wikipedia.org/wiki/Vitamin_B12_deficiency

   Vitamin B 12 cannot be produced by the human body, and must be obtained from the diet. [2] The body normally gets enough vitamin B 12 from the consumption of foods from animal sources. [2] Inadequate dietary intake of animal products such as eggs, meat, milk, fish, fowl (and some types of edible algae) can result in a deficiency state. [135]

6. Haptocorrin - Wikipedia

   en.wikipedia.org/wiki/Haptocorrin

   The same cells in the stomach that produce gastric hydrochloric acid, the parietal cells, also produce a molecule called the intrinsic factor (IF), which binds the B 12 after its release from haptocorrin by digestion, and without which only 1% of vitamin B 12 is absorbed. Intrinsic factor (IF) is a glycoprotein, with a molecular weight of 45 kDa.

7. Vitamin B12 total synthesis - Wikipedia

   en.wikipedia.org/wiki/Vitamin_B12_total_synthesis

   The structure of vitamin B 12 was the first low-molecular weight natural product determined by x-ray analysis rather than by chemical degradation. Thus, while the structure of this novel type of complex biomolecule was established, its chemistry remained essentially unknown; exploration of this chemistry became one of the tasks of the vitamin's chemical synthesis.