b12 injections for parkinson's B-12 (Cyanocobalamin) Shot Therapy Carbidopa/levodopa, Vitamin B6 & B12:

Though B vitamin injections have been used to purportedly treat many maladies, including cancer and fibromyalgia, Cancer.org emphatically states that available scientific evidence does not support claims that any B vitamin is an effective treatment for people who already have cancer

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Exploration of NAD-related and enzymatic activity models

Even the parent protein (TB4) failed to make it through the approval process

There is some limited preclinical data that it could impact tissues involved in reproduction, but direct, reliable evidence showing a connection to improved human fertility is missing at this time