Red rash after pinning - bad bac water?

get that adrenaline rush feeling a minute after pinning sometimes. lasts a few minutes but doesn't happen every time.
 
A rash at the pin site usually means contaminated bac water, a GHK-cu sensitivity, or surface prep issue - testing each variable by pinning one peptide at a time identifies the driver.
 
The plunger-pull technique is the standard workaround when drawing from a multi-use vial - keeps the needle in place and avoids recontaminating the rubber stopper.
 
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