In the 50s, when chemotherapy wasnt yet available, massive doses of B12 shots were given to children with a neuroblastoma tumor every two days, for 2-3 years with great success: NEUROBLASTOMA: AN EVALUATION OF ITS NATURAL HISTORY AND EFFECTS OF THERAPY, WITH PARTICULAR REFERENCE TO TREATMENT BY MASSIVE DOSES OF VITAMIN B12
The desire to turn things around is understandable, but peptides like Kisspeptin-10 probably arent your best bet quite yet
The studies documenting hair-relevant effects DPC proliferation, follicle elongation, stem cell recovery used direct tissue contact, which topical application most closely replicates
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