Ingredient Repository · Ingredient

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Ingredient

Zeaxanthin

A macular xanthophyll carotenoid that accumulates in the central retina to protect against blue light and oxidative stress.

What it is

Zeaxanthin is a structural isomer of lutein and a non-provitamin A xanthophyll carotenoid isolated commercially from marigold flowers (Tagetes erecta) or paprika. In dietary supplements, it is provided as free zeaxanthin or meso-zeaxanthin in oil-based softgels or beadlets. Zeaxanthin selectively concentrates in the central fovea of the retinal macula lutea, providing targeted optical filtration of high-energy blue wavelengths and inhibiting light-induced singlet oxygen generation.

Also known as: Marigold extract zeaxanthin

What it does

  • Concentrates in the central retinal macula to optimize optical density and blue-light filtration.
  • Protects retinal photoreceptor cells against light-induced oxidative membrane damage.
  • Supports visual sharpness, contrast sensitivity, and glare tolerance under bright lighting.

Amplified by probiotics

Zeaxanthin is a non-polar xanthophyll whose intestinal absorption requires incorporation into mixed lipid-bile salt micelles. Commensal gut probiotics expressing bile-salt hydrolase (BSH) modulate the conjugation state of luminal bile acids, facilitating efficient micellar emulsification. Furthermore, probiotic fermentation generates short-chain fatty acids (SCFAs) that nourish mucosal enterocytes and maintain intestinal epithelial tight junction assembly. A healthy, non-inflamed gut mucosa maintains optimal expression of enterocyte scavenger receptors (SR-BI and CD36), enabling efficient zeaxanthin absorption and chylomicron packaging for systemic delivery to ocular tissues.

Typical dose

2–5 mg/day

The evidence

Evidence: strong

Major clinical research from the AREDS2 trial proves that daily zeaxanthin combined with lutein increases macular pigment optical density and protects visual health in aging populations (AREDS2 Research Group 2013, JAMA). Mechanistic and clinical reviews establish its critical role alongside lutein in retinal photoprotection (Bhosale 2020, Arch Biochem Biophys).

  1. AREDS2 Research Group. Lutein + zeaxanthin and omega-3 fatty acids for age-related macular degeneration: the Age-Related Eye Disease Study 2 (AREDS2) randomized clinical trial. JAMA. 2013;309(19):2005-2015. PubMed ↗
  2. Bhosale P, Bernstein PS. A Mechanistic Review of β-Carotene, Lutein, and Zeaxanthin in Eye Health. Arch Biochem Biophys. 2020;696:108669. PubMed ↗

Safety & who should check first

High safety profile confirmed in large human trials up to 10 mg/day with no adverse effects reported. Safe during pregnancy and lactation within normal dietary/supplement levels.