Solid-phase peptide synthesis of D-amino acid chains of this length requires specialized reagents (D-Fmoc amino acids are significantly more expensive than their L-counterparts), extended synthesis times, and careful quality control to ensure correct sequence and sufficient purity
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Personally, I know through genetic testing that I have the SNP (single nucleotide polymorphism) rs1050450(C;T) on my GPX1 gene which reduces my glutathione peroxidase activity and therefore my ability to combat oxidative stress
Elbialy ZI, Gamal S, Al-Hawary II, Shukry M, Salah AS, Aboshosha AA, Assar DH (2022) Exploring the impacts of different fasting and refeeding regimes on Nile tilapia (Oreochromis niloticus L.): growth performance, histopathological study, and expression levels of some muscle growth-related genes