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Rotate sites systematically (abdomen, thighs, upper arms) to avoid lipohypertrophy [8]

"Analytical approaches for the detection of emerging therapeutics and non-approved drugs in human doping controls." Journal of pharmaceutical and biomedical analysis 101 (2014): 66-83.

Personally I would not worry to much about this effect, given that CPs have other very attractive effects that can promote beard growth

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Researchers designing combination protocols can order separate batches with separate batch-specific COAs, which is generally required for research protocol documentation regardless of whether the compounds are used sequentially or in parallel