The various forms of vitamin K are all fat-soluble molecules, each with the same methylated naphthoquinone ring structure. The two main forms of vitamin K are vitamin K1 and vitamin K2.

Allergic reactions to vitamin B12 are rare, but real. The reason may sound strange, but it's true - an allergy to cobalt. What's going on here? ... To be fair to Hari, I do not know one organic ...

Vitamin B12 is an essential nutrient our bodies need to function. Here's why it's important and why you need enough. Sean Jackson is a creative copywriter living in Florida. He's had work ...

Vitamin B12 can contribute to energy, mood, cognitive function and heart health. Read more about the benefits, deficiencies and how much you need.

Vitamin B12 is important for many processes in your body. This article explains the benefits, downsides, and more of vitamin B12 liquid supplements.

Older adults and vegans are at higher risk of being deficient in vitamin B12. For people with normal blood levels, the supplement has no proven benefits.

Methylmalonic Acid Test Results. You may have a vitamin B12 deficiency if you have higher than normal levels of MMA. The tests don’t reveal exactly how serious your deficiency is.