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This is a normal part of the aging process

On the other hand, lutein is the main substance found in the outer area of the retina [245]

The studies have suggested that in comparison with rodents, relatively little AFB1-GSH conjugate is produced by human liver, but insufficient data exist to be certain that this reaction is not of physiological importance in man, particularly as an aflatoxin mercapturate has been detected in the urine of marmoset monkeys treated with AFB 1

If you intend to freeze a peptide solution, and especially if its a larger protein or enzyme, a cryoprotectant like 510% glycerol can be beneficial