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p75NTR receptor: Binds all neurotrophins but with different functional outcomes than Trk receptors

However, levels of GHK-Cu decline significantly with age

Balmer FM, Smith FA, Leach LJ, et al

Clin Pharmacol Ther 1991;50:695-701

Magnesium can interfere with absorption of tetracyclines, quinolones, and nitrofurantoin, so Mount Sinai recommends supplementing with magnesium one hour before or two hours after taking these medications
