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Freeze-thaw cycling is especially destructive to peptides each cycle forms ice crystals that physically shear the molecule, so even one accidental freeze can tank a vial
If you are arranging US delivery from Canada, plan ahead so your injection schedule, storage needs, and refill timing stay aligned
But what usually gives them away is their B12 levels
doi:10.1016/j.molmet.2021.101165 (PMID 33453420) Kraus D, Yang Q, Kong D, et al
This is because there are fewer blood vessels in the fatty tissues beneath our skin
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