<?xml version="1.0" encoding="UTF-8"?><rss version="2.0"><channel><title>Sine Cera journal</title><description>Copper peptides, labels and certificates, and how skincare is regulated in New Zealand.</description><link>https://sinecera.co.nz/</link><item><title>GHK vs AHK: what&apos;s actually different</title><link>https://sinecera.co.nz/journal/ghk-vs-ahk-whats-actually-different/</link><guid isPermaLink="true">https://sinecera.co.nz/journal/ghk-vs-ahk-whats-actually-different/</guid><description>GHK-Cu and AHK-Cu differ by a single amino acid. Here&apos;s what that changes, what it doesn&apos;t, and how to choose between them.</description><pubDate>Sat, 14 Nov 2026 00:00:00 GMT</pubDate></item><item><title>How to read a certificate of analysis</title><link>https://sinecera.co.nz/journal/how-to-read-a-certificate-of-analysis/</link><guid isPermaLink="true">https://sinecera.co.nz/journal/how-to-read-a-certificate-of-analysis/</guid><description>A line-by-line guide to a peptide certificate of analysis: what each test means, what good results look like, and the signs a COA can&apos;t be trusted.</description><pubDate>Fri, 13 Nov 2026 00:00:00 GMT</pubDate></item></channel></rss>