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You are checking for clarity, meaning you should be able to see through the liquid clearly

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How to Tell If BPC-157 Has Gone Bad Visual signs of BPC-157 degradation include: Lyophilized powder: Color change (from white/off-white to darker yellow or brown) Visible clumping or moisture in the vial Powder appearing to have dissolved or partially melted Reconstituted solution: Cloudiness or visible particles Color change beyond slight yellow tint Visible precipitation or sedimentation Any of these signs indicate the vial should be discarded

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