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ghk cu hair growth human study randomized Peptide Clinical Trial (2016) — Research Summary Cu and Acetyl Tetrapeptide 1 year Fin/2 months GHK-CU
Description
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These suggest 5mg may be hitting too hard

In people with confirmed B12 deficiency, supplementation is required, with the choice of formulation, duration and dosage dependent on the underlying cause and severity of the deficiency and patient preference

Its worth noting that excess B12 blood serum levels can come from taking the common, cheap form of B12, cyanocobalamin, which for many does not convert into an active form the body needs to absorb and use - therefore it does not get transported for cellular use (and is instead floating around in the bloodstream without positive effect)

NR IV showed better tolerability than NAD+ IV, with a 75% shorter mean infusion time [5]