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Zettler is not so sure

A clearer framework would make it significantly easier for consumers to distinguish legitimate products from the grey market, and will continue to attract leading researchers and production labs to the US market

At this level, GHK-Cu can potentially reach tissues and organs beyond the skin including joints, muscles, internal organs, and the central nervous system enabling the full spectrum of its gene-expression modulating activity

A 1 mL aliquot of the supernatants pooled from the successive acetone extracts was transferred to a 1-mL quartz cuvette, and absorbance was monitored at 647 nm and 663 nm with a BioTek Epoch 2 spectrophotometer (Fisher Scientific Canada)

This regimen should be followed by 100 mcg monthly for life