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Description
M + n is the 13 C ion of the metabolite
Freezing and thawing can cause the peptide to aggregate and lose its structure, potentially rendering it inactive or altering its absorption characteristics

Seifert L, Werba G, Tiwari S, Giao Ly NN, Alothman S, Alqunaibit D, et al

We can usually pinpoint the weekend on the calendar that explains the result
