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Although L-tyrosine is a non-essential amino acid that can be synthesized endogenously from phenylalanine via the enzyme phenylalanine hydroxylase, its synthesis may become insufficient under conditions of physiological stress, rapid growth, or limited phenylalanine availability [71]
10.1016/S0891-5849(99)00051-9 291 WiniewskiM.BieniekA.RoszekK.CzarneckaJ.BolibokP.FerrerP.et al (2018)
Avoid saunas and hot tubs
For budget-conscious shoppers and those who know they want a long-term NAC supply, that trade-off may still be worth making
No well-powered human RCT has demonstrated significant muscle hypertrophy from IGF-1 LR3 specifically
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