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The tablets should be stored sealed, light-proof, in a cool and dry place, away from high temperature and humidity to prevent deterioration and loss of efficacy

For the broader cosmetic OEM workflow including formulation development, stability testing, and regulatory support, see our GHK-Cu formulation guide and med-spa buyer's playbook.

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While I have never used expired b12 vials since a pharmacist told me not to I have used multi-use vials after 28 days when they are supposed to be discarded and unrefrigerated once opened as well

Light exposure can harm the formulation and affect its efficacy, so store with no exposure to light