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Many experts argue it is not

Number of sessions: Initial Phase: 1 session per week for 5-6 weeks

It is also a co-factor for two enzymes in mammals (and you are a mammal) one is methionine synthase, the other is methylmalonyl-CoA mutase

Oxidative stress and antioxidant strategies in dermatology
What Should I Expect During Vitamin B12 Shots