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It is not approved by the FDA, EMA, or comparable regulators as a drug for treating androgenetic alopecia, telogen effluvium, or any other hair-loss condition

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Singh M, Jindal D, Kumar R, Pancham P, Haider S, Gupta V, et al

Petersburg Institute of Bioregulation and Gerontology, epithalon is a synthetic tetrapeptide (a sequence of four amino acids) that has been shown to induce telomerase activity and telomere elongation in human somatic cells [1]

Your GP isnt cross-referencing the pharmacokinetics of extracellular GSH degradation

18 Table 4 Time to Improvement of Abnormalities in Vitamin B12 Deficiency After Initiation of Treatment A 2005 Cochrane review involving 108 patients with vitamin B 12 deficiency found that high-dose oral replacement (1 mg to 2 mg per day) was as effective as parenteral administration for correcting anemia and neurologic symptoms