You can purchase a Sharps Container, a hard-plastic container made for used syringes and needles, at your local pharmacy
Copper peptides are delicate, and using these active ingredients in the same step could cancel out the copper peptides, making them less effective or causing skin irritation
However, the source paper contains inconsistent descriptions of the SPR concentration rangethe figure legend specifies 23.4496,000 nM, whereas the methods section lists 1.8931.25 nM, a discrepancy of several thousand-fold

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Nat Rev Dis Primers