unspecified/undisclosed form
unspecified/undisclosed form is a unrated form of Astaxanthin, used in 688 on-market products .
688
on-market products
unrated
quality tier
n/a
elemental fraction
Why this tier: Label discloses only "Astaxanthin" with no source (natural algal vs synthetic) or delivery matrix; delivery matrix matters (lipid-based formulations raised bioavailability 1.7-3.7x in a single-dose human study).
Source: Mercke Odeberg J et al. 2003, Eur J Pharm Sci 19(4):299-304, PMID 12885395