They are referred to as vitamers having vitamin activity as a coenzyme, meaning that its presence is required for some enzyme-catalyzed reactions
Oral supplements: can work for mild deficiency and maintenance in people who absorb B12 normally, but tend to take longer and are less reliable when absorption is impaired
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At Midi, we hear from women every day who are coping with changes to their libido, and, in many cases, vaginal dryness can be one major culprit
But its been shown that symptoms can begin as low as 400 pg/ml, so the US normals are definitely not OK