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L-glutathione is a tripeptide naturally present in the body, composed of three amino acids: glutamic acid, cysteine and glycine

As skin ages, it makes less collagen and elastin, which leads to fine lines and a loss of firmness

NK, natural killer

Many people find that maintaining healthy levels of this amino acid helps manage the common soreness that follows a heavy lifting session or a long run

Surprisingly, this additional activity was not recovered in isolated erythrocytes, but only in serum (Figure 2a)

The peptide triggers gene expression changes in over 4,000 genes that persist beyond the moment of injection (Pickart & Margolina, 2018)