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The remaining 3 studies, scored eight and nine, indicating high-quality studies with low risk of bias (Table 5)

however, clinical trials in humans are very limited

(2023): Effects of diet containing astaxanthin on visual function in healthy individuals: a randomized, double-blind, placebo-controlled, parallel study

It is also required for growth and for health of skin and mucous membranes, as well as vision

Bon A, Morfini M, Dini A, Mori F, Barni S, Gianluca S, et al

That introduces measurement error
