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This is not simply about getting peptides into your nose
Additionally, older adults have a harder time absorbing vitamin B12
Verification: Live search confirms that human plasma concentrations of GHK-Cu drop by over 60% during a standard human lifespan, falling from approximately 200 ng/mL at age 20 to 80 ng/mL by age 60
Many people use copper peptides as a gentler alternative or as part of a barrier-focused anti-aging routine
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