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Wait at least 30-60 seconds between sprays in the same nostril to avoid oversaturation and runoff

Featuring GHK-Cu peptide, it encourages tissue regeneration and reduces fine lines with potent collagen and elastin support

Access options Access Nature and 54 other Nature Portfolio journals Get Nature+, our best-value online-access subscription $32.99 / 30 days cancel any time Subscribe to this journal Receive 52 print issues and online access $199.00 per year only $3.83 per issue Rent or buy this article Prices vary by article type from$1.95 to$39.95 Prices may be subject to local taxes which are calculated during checkout Nature 630 , 280-281 (2024) doi: References Freijedo-Farinas, F., Ruano-Ravina, A., Prez-Ros, M., Ross, J

And the growth hormone whose production they are alleged to increase is natural, making testing even harder