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In some embodiments, the particle size is less than 450 nm, less than 400 nm, less than 350 nm, less than 300 nm, less than 275 nm, less than 250 nm, less than 225 nm, less than 200 nm in size, less than 175 nm, less than 150 nm, or less than 125 nm, or less than 100 nm

For GHK-Cu specifically: What to Look For: Third-party COA testing (6 months fresh maximum) Proper storage (GHK-Cu degrades rapidly in solution) Copper complex verification (some products are just GHK without copper) Appropriate pH (too acidic = irritation, too basic = instability) Reputable vendor track record Red Flags: Pre-mixed serums stored at room temp No testing documentation Suspiciously cheap pricing Miracle cure marketing claims No batch numbers or traceability I update vendor comparisons twice daily on my platform for a reasonquality control in this space is inconsistent at best

The Lancet Diabetes & Endocrinology, 10 (3), 177192

Hypromellose Eye Drops are for external use only