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April 22, 2026: Removed from Category 2 On April 15, 2026, the FDA published a 503A category revision removing 12 peptides from Category 2 effective seven calendar days later (April 22)
Some contain cheaper and less absorbable ingredients
If your B12 levels are already in the normal range, taking extra B12 on its own is unlikely to produce visible hair changes
For context, the underlying lyophilized peptide can remain stable for one to two years or longer when stored correctly before reconstitution, making the post-reconstitution window the most critical and time-limited phase of the entire storage cycle
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