# Zeaxanthin (3R,3'R)-β,β-carotene-3,3'-diol

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/zeaxanthin-carotene-3-3-diol
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-19
**Evidence Score:** 4 / 10
**Category:** Compound
**Also Known As:** (3R,3'R)-β,β-carotene-3,3'-diol, β-carotene-3,3'-diol, meso-zeaxanthin, all-trans-zeaxanthin, (3R,3'R)-zeaxanthin, xanthophyll, lutein isomer

## Overview

Zeaxanthin is a xanthophyll carotenoid that selectively accumulates in the macular region of the retina, where it is bound by the protein GSTP1 ([glutathione](/ingredients/condition/detox) S-transferase Pi 1) to form the macular pigment. It functions as a high-energy blue-light filter and antioxidant, neutralizing [reactive oxygen species](/ingredients/condition/antioxidant) and triplet-state molecules that would otherwise damage photoreceptor cells.

## Health Benefits

• No specific health benefits can be cited as the research dossier contains no clinical trial data
• The compound is known to accumulate in the macula of the eye via a zeaxanthin-binding protein
• Acts as a non-photochemical quencher for excess triplet chlorophyll in plants
• Functions as a blue light photoreceptor in plant guard cells
• Note: Clinical evidence for human health benefits is not provided in the available research

## Mechanism of Action

Zeaxanthin accumulates in the fovea centralis of the macula via selective binding to GSTP1 ([glutathione](/ingredients/condition/detox) S-transferase Pi 1) and StAR-related lipid transfer proteins (StARD3/PCTP-L), forming a dense optical filter that absorbs wavelengths between 400–500 nm. As an antioxidant, it quenches singlet oxygen and peroxyl radicals through electron delocalization across its conjugated polyene backbone, preventing [lipid peroxidation](/ingredients/condition/antioxidant) in photoreceptor outer-segment membranes. Its (3R,3'R) stereochemistry is metabolically distinct from lutein-derived meso-zeaxanthin ((3R,3'S)), and both forms contribute to macular pigment optical density (MPOD).

## Clinical Summary

The most robust evidence for zeaxanthin comes from the AREDS2 trial (n=4,203), which used a combined lutein (10 mg) and zeaxanthin (2 mg) supplement and found a 26% reduction in progression to advanced age-related macular degeneration (AMD) versus the original beta-carotene formulation. Smaller randomized controlled trials, including a 2017 study by Akuffo et al. (n=121), demonstrated statistically significant increases in macular pigment optical density (MPOD) after 12 months of supplementation with zeaxanthin and lutein. Evidence for standalone zeaxanthin at isolated doses is limited, as most trials use combined carotenoid formulations, making it difficult to attribute outcomes to zeaxanthin alone. Overall evidence quality for AMD risk reduction is moderate-to-strong, while evidence for [cognitive](/ingredients/condition/cognitive) or [cardiovascular](/ingredients/condition/heart-health) benefits remains preliminary and insufficient for clinical claims.

## Nutritional Profile

Zeaxanthin [(3R,3'R)-β,β-carotene-3,3'-diol] is a oxygenated carotenoid (xanthophyll) with the molecular formula C₄₀H₅₆O₂ and molecular weight 568.87 g/mol. It is not a macronutrient source and provides negligible calories, protein, fat, or carbohydrate when consumed in physiologically relevant quantities. Key bioactive characteristics: • It is a C₄₀ tetraterpenoid with 11 conjugated double bonds, conferring strong absorption in the blue-light region (~450–480 nm) and potent singlet oxygen quenching / triplet-state chlorophyll quenching activity. • It bears two hydroxyl groups at the 3 and 3' positions (both in the R-configuration), distinguishing it from its stereoisomer meso-zeaxanthin (3R,3'S) and its structural isomer lutein (β,ε-carotene-3,3'-diol). • Dietary sources include yellow corn (~0.5–1.0 mg/100 g), orange peppers (~1.5–2.0 mg/100 g), egg yolks (~0.2–0.4 mg per yolk), goji berries (Lycium barbarum, ~2–80 mg/100 g dry weight depending on cultivar), and various orange/yellow fruits and vegetables. • As a lipophilic compound (logP ~8–9), its bioavailability is highly dependent on co-ingestion with dietary fat; absorption occurs via passive diffusion and scavenger receptor class B type 1 (SR-B1) in intestinal enterocytes. Micellar solubilization with bile salts and dietary lipids enhances absorption; estimated bioavailability from food matrices ranges from ~5–30% depending on food matrix, fat content, and processing (e.g., cooking/homogenization increases release from plant cell walls). • It is transported in blood primarily on HDL and LDL lipoproteins, with typical human plasma concentrations of ~0.02–0.12 µmol/L. • It selectively accumulates in the macula lutea of the human retina, where it is bound by a specific zeaxanthin-binding protein ([glutathione](/ingredients/condition/detox) S-transferase Pi, GSTP1), reaching macular concentrations up to ~0.1–1.0 mM—among the highest tissue-specific carotenoid concentrations in the body. • No provitamin A activity (unlike β-carotene), as the two hydroxylated β-ionone rings prevent enzymatic cleavage to retinal. • Contains no vitamins, minerals, fiber, or protein intrinsically; its nutritional significance is solely as a bioactive xanthophyll pigment with [antioxidant](/ingredients/condition/antioxidant) properties (singlet oxygen quenching rate constant ~1.0 × 10¹⁰ M⁻¹s⁻¹, comparable to other C₄₀ carotenoids). • Typical supplemental doses studied range from 2–20 mg/day; dietary intake in Western diets averages approximately 0.5–2.0 mg/day combined with lutein.

## Dosage & Preparation

No clinically studied dosage ranges for extracts, powders, or standardized forms are specified in the available research. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Zeaxanthin is generally recognized as safe (GRAS) at supplemental doses of 2–20 mg per day, with no serious adverse events reported in clinical trials up to 24 months in duration. High-dose carotenoid supplementation has occasionally produced carotenodermia (yellowing of the skin), a benign and reversible condition. Unlike beta-carotene, zeaxanthin has not been associated with increased lung cancer risk in smokers, though data specific to isolated zeaxanthin in this population are limited. No clinically significant drug interactions have been established, but concurrent use with orlistat (a fat absorption inhibitor) may reduce zeaxanthin bioavailability; pregnancy safety data are insufficient, and supplementation during pregnancy should be discussed with a healthcare provider.

## Scientific Research

The research dossier explicitly states that search results lack details on key human clinical trials, RCTs, or meta-analyses with PubMed PMIDs. No specific clinical evidence, study designs, sample sizes, or outcomes are provided in the sources.

## Historical & Cultural Context

The research dossier contains no information about traditional or historical uses of zeaxanthin in traditional medicine systems.

## Synergistic Combinations

Lutein, beta-carotene, vitamin A, vitamin E, omega-3 fatty acids

## Frequently Asked Questions

### What is the difference between zeaxanthin and lutein?

Zeaxanthin ((3R,3'R)-β,β-carotene-3,3'-diol) and lutein ((3R,3'S,6'R)-β,ε-carotene-3,3'-diol) are structural isomers sharing the same molecular formula (C40H56O2) but differing in the position of a double bond in one end ring. In the retina, zeaxanthin concentrates in the fovea centralis, while lutein predominates in the parafoveal region; both are bound by distinct proteins (GSTP1 for zeaxanthin, GSTP1 and HR-LBP for lutein) and together constitute macular pigment optical density (MPOD).

### How much zeaxanthin should I take per day?

The most evidence-supported supplemental dose is 2 mg per day of zeaxanthin combined with 10 mg of lutein, as used in the AREDS2 clinical trial (n=4,203). Some studies have used up to 20 mg per day without documented toxicity, but doses above 2–4 mg offer no clearly established additional benefit based on current trial data. There is no established Recommended Dietary Allowance (RDA) for zeaxanthin from regulatory agencies such as the FDA or EFSA.

### What foods are highest in zeaxanthin?

Corn (yellow maize) is among the richest dietary sources of zeaxanthin, providing approximately 500–900 µg per 100 g. Orange bell peppers and goji berries (Lycium barbarum) are also notably high, with goji berries providing up to 82 mg per 100 g dry weight in some analyses. Egg yolks contain zeaxanthin in a highly bioavailable micellar form due to the surrounding lipid matrix, making them a functionally efficient dietary source despite lower absolute concentrations.

### Can zeaxanthin prevent age-related macular degeneration (AMD)?

Zeaxanthin, in combination with lutein (10 mg lutein / 2 mg zeaxanthin), reduced progression to advanced AMD by approximately 26% in the AREDS2 randomized controlled trial compared to the original AREDS beta-carotene formulation. The mechanism is attributed to increased MPOD, which reduces phototoxic blue-light damage and oxidative stress in the retinal pigment epithelium (RPE). Importantly, this evidence addresses slowing progression in individuals already diagnosed with intermediate AMD, not primary prevention in healthy populations.

### Is zeaxanthin fat-soluble and how should I take it for best absorption?

Yes, zeaxanthin is a fat-soluble xanthophyll carotenoid and its intestinal absorption is dependent on the presence of dietary lipids to facilitate incorporation into mixed micelles and subsequent chylomicron packaging. Studies show that consuming zeaxanthin with a meal containing at least 3–5 g of fat significantly increases plasma uptake compared to fasted or low-fat conditions. Formulations using lipid-based delivery systems (e.g., softgels with oil carriers such as sunflower or olive oil) generally outperform dry tablet formulations in terms of bioavailability.

### Is zeaxanthin safe to take during pregnancy and breastfeeding?

While zeaxanthin is a naturally occurring carotenoid found in foods commonly consumed during pregnancy, specific safety data for supplemental zeaxanthin in pregnant and breastfeeding women is limited. Pregnant individuals should consult their healthcare provider before starting any new supplement, as personalized guidance based on individual health status is recommended during this period.

### Can zeaxanthin interact with medications or other supplements?

Zeaxanthin is fat-soluble and may theoretically interact with medications that affect fat absorption, though clinically significant interactions are not well-documented in the literature. If you take blood thinners, cholesterol-lowering drugs, or other medications affecting nutrient absorption, discuss zeaxanthin supplementation with your healthcare provider to ensure safety.

### What is the difference between zeaxanthin isomers and which form is used in supplements?

The (3R,3'R)-configuration refers to the specific molecular structure of naturally occurring zeaxanthin, which is the predominant form found in the human macula and in food sources. Most commercial zeaxanthin supplements use this naturally-derived isomer, which differs from synthetic forms that may contain mixed isomers with potentially different tissue accumulation patterns.

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