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10.3390/biomedicines9080992 153 KimJ.-Y.KimK.-H.LeeW.-R.AnH.-J.LeeS.-J.HanS.-M.et al (2015a)

Prescribing unapproved drugs means using substances that have never received FDA approval for any use, which violates federal regulations

That said, theres minimal risk to trying PQQ supplements

Association of metformin use with cancer incidence and mortality: a meta-analysis

One idea was to take stem cells from the bone marrow and implant them in the Brain (stem cell injection, stem cell transplantation)
