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As we age, our levels of NMN naturally decline, which can lead to a wide range of age-related health issues

In a serum or cream, copper peptides are lab-made for consistency, stability and safety

This concept is now taken seriously in research, and it has helped probiotics become a major part of the K-wellness conversation

Some vendors offer this option, while others do not

In this guide, we explain what these peptides are, what the science says so far, the risks you should know about, and what changed with the FDA in 2026

Research (PMID: 38599632) found that glycyl-L-histidyl-L-lysine prevents copper- and zinc-induced protein aggregation, suggesting potential applications in neurodegenerative research where metal-induced protein misfolding is of interest