Free (unesterified) Lutein
Free (unesterified) Lutein is a tier 1 form of Lutein, used in 1,695 on-market products .
1,695
on-market products
tier 1
quality tier
n/a
elemental fraction
Why this tier: Free (unesterified) lutein, the usual supplement form in the large AREDS2 RCT (the AREDS2 abstract does not itself state the chemical form); its bioavailability was not shown to differ from esters (Olmedilla-Alonso 2024).
Source: AREDS2 Research Group 2013, JAMA 309(19):2005-2015, PMID 23644932