A well-functioning methylation cycle generates the amino acid cysteine, which you can read more about here
Levels of this peptide decline with age, which is one reason the bodys ability to repair tissue, produce collagen, and recover from inflammation slows over time
MS/MS of modified rat MGST1 peptide, VFANPEDC * AGFGK, was confirmed by comparison to previously analyzed standard peptide (Golizeh et al., Table 5
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doi: 10.3389/fimmu.2020.01229 238 SamiecP.Drews-BotschC.FlaggE.KurtzJ.SternbergJ.ReedR.et al
Some foods rich in sulfur amino acids are cruciferous vegetables, turkey, beef, chicken, nuts, legumes, allium vegetables like garlic, onions, leeks, and shallots, and leafy greens