Seaweed & kelp foods (nori, wakame, kombu, dulse) — HMTc Standard — page updateshttps://heavymetalcertified.com/standards/seaweed-kelp-foodsPublished revisions of this Heavy Metal Certified page.Seaweed & kelp foods (nori, wakame, kombu, dulse) — HMTc Standardhttps://heavymetalcertified.com/standards/seaweed-kelp-foodshttps://heavymetalcertified.com/standards/seaweed-kelp-foods#revision-59c8207d0601f767Mon, 21 Sep 2026 04:04:58 GMTThe Heavy Metal Tested & Certified standard for seaweed and kelp foods — nori, wakame, kombu, dulse — dried, stated as sold. Seaweed concentrates arsenic and heavy metals on drying, and the ceilings reflect the strictest government maximum for the dried product form; every limit is the strictest maximum level any credible government sets for dried seaweed.