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In many cases, you have no reliable way of knowing what is actually in the vial you receive

So, what are they, at least in theory

Cyclodextrin formulations/compositions In a specific embodiment, the formulation or composition alternatively comprises a cyclodextrin

Cyanocobalamin Synthetic Vitamin B12 As we have discussed, for many years B12 supplements mainly contained cyanocobalamin , a synthetic form of B12 that is not directly bioactive and is only found naturally in the body or diet in minor traces

They can also cause side effects like dizziness, stomach upset, or feeling very tired, which makes some patients stop using them