The Claim
The bioavailability of lutein does not differ significantly between free and ester forms when administered at 6 mg/day for up to two months in healthy adults, resulting in equivalent serum concentrations.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
When healthy adults take 6 mg of lutein daily for up to two months, the amount of lutein that enters the bloodstream is the same whether it comes from free lutein or lutein ester supplements.
See the scientific wording
There is no significant difference in the bioavailability of lutein between free and ester forms when administered at 6 mg/day for up to two months in healthy adults, suggesting that commercial lutein ester supplements are as effective as free lutein for raising serum concentrations.
When lutein is taken as a supplement, whether it's bound to fatty acids or not, the body breaks off the fatty acids in the gut, turns it into the same free form, mixes it with fats to make it soluble, absorbs it into the gut cells, packs it into fat-carrying particles, and sends it into the blood where it circulates and builds up to the same level regardless of the original form.
What the research says
1 studyThis study found that whether you take lutein in its natural form or bound to fatty acids (esters), your blood levels go up the same amount after taking 6 mg a day for two months. So, lutein supplements with esters work just as well as those with free lutein.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.