The peptide could be degraded, the water could be contaminated, or the vial temperature may have caused precipitation
Yeast are typically used to produce selenomethionine for supplements
If a patient is deficient in active Vitamin B6 (a common occurrence due to the gut dysbiosis frequently seen in Long COVID), the transsulfuration pathway becomes completely blocked
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doi: 10.1186/s13046-019-1035-0 123 YanHZhengCLiZBaoBYangBHouKet al
This type of stress damages cellular structures, resulting in the degradation of DNA, proteins, lipids and membranes as indicated by (66, 67)