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The authors also point out that in some rare genetic disorders of B12 metabolism, the active forms may be required, and that smokers, who tend to have an excess of thiocyanate in their blood, may benefit from a taking a form other than cyano-B12

Itching or a mild rash may occur rarely

The human milk globules have an even more unique tri-layer structure

Supplements generally arent recommended unless you have anemia caused from iron deficiency. Excess iron can damage organs and cause side effects such as constipation and heartburn, so its important to follow your healthcare providers dosing instructions and to pay attention to the form of iron they suggest, as there are many available (ferrous sulfate, ferrous fumarate, ferrous gluconate, etc.) and not all will be ideal for you