Interaction of estrogenic chemicals and phytoestrogens with estrogen receptor
The injection is providing you with the necessary B vitamins regardless of your food intake, which is helpful especially if you have trouble eating a balanced diet (due to illness or other reasons)
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For supplements, you can make structure/function claims ("supports skin elasticity") but not disease claims ("cures arthritis"), you must include the FDA disclaimer on your label, and you must have real scientific evidence for every claim