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Sample type considerations Different biological matrices have different detection characteristics: Urine: Most common testing matrix, metabolites accumulate Blood/plasma: Shorter detection windows for most peptides Dried blood spots: Emerging method with good sensitivity Hair: Not commonly used for peptides but theoretically possible Most anti-doping testing uses urine

A pen, vial, compounded medication, provider-directed peptide therapy, or research-use product can raise different supply questions

Benoist CC, Kawas LH, Zhu M, Tyson KA, Stillmaker L, Appleyard SM, Wright JW, Wayman GA, Harding JW

Best Practices for Storing Reconstituted Peptides: Temperature : Reconstituted peptides should be stored at -20C or lower, depending on their stability in solution