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Running these together during a loading phase (especially for joint, tendon, or connective tissue goals) is a well-established protocol

Carry it in hand luggage rather than checked baggage to reduce the risk of loss or temperature exposure

PMID: 29998800 Seiwerth S, Brcic L, Batelja Vuletic L, et al

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Tretinoin can cause temporary dryness, flaking, or purging during the adjustment period (niacinamide often helps minimize this)