Dropped my Reta - still good?

Lyophilized powder in sealed vials handles a drop off a counter without losing potency - the fragility concern is post-reconstitution storage, not the dry powder itself. As long as the seal wasn't compromised, the product is fine.
 
Lyophilized reta that's been dropped should be fine - the powder form is more stable than the reconstituted version and physical shock doesn't degrade the peptide bonds. Where things get more careful is in the reconstituted form, which is more sensitive to temperature and freeze-thaw cycles.
 
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