b12 injection methylcobalamin or cyanocobalamin Compounded (Vitamin B12) Methycobal Injection powerfully 500 mcg

The route of administration is a critical factor

Cyanocobalamin specifically appears in most formulations rather than methylcobalamin, adenosylcobalamin, or hydroxocobalamin

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Hydroquinone and other skin lighteners work for those with dark pigmentation under their eyes (although do seek a doctors opinion first because usually darkness under the eyes is actually very thin skin with blood vessels showing through it - and lightening agents will not help, but could hurt thin skin) 5