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Plasma and RBCs were aliquoted into separate vials and stored at -20C

Those points must be evaluated from the applicable specification and batch information

Using a diluent with a substantially different preservative concentration, or substituting an unrelated solvent, can introduce unpredictable interactions with the peptide's amino acid side chains

Bad lifestyles such as prolonged heavy drinking, coffee consumption or smoking can lead to elevated Hcy level by reducing intake or increasing consumption of B vitamins and FA

Stanhiser J, Jukic AMZ, Steiner AZ

Then the company posts results of the testing on their website for reference