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As we age, our bodies absorb B12 from food sources less efficiently
Human-grade peptides are sourced from licensed compounding pharmacies that follow pharmaceutical manufacturing standards, while research-grade peptides are labeled "not for human use" and are not subject to the same quality controls
Some research protocols require preservative-free sterile water rather than bacteriostatic water
Freezing creates ice crystals that physically damage peptide structures
Patients should be advised to report any unusual symptoms promptly
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