🔑 Core Function

• 👁️ Macular concentration: Form the yellow pigment in the retina (macula).
• 🔵 Blue light filter: Help protect photoreceptors from high-energy blue light.
• 🛡️ Antioxidant defence: Neutralise free radicals to support long-term retinal health.

🧬 Family & Essentiality

🌿 Plain-Language Summary

Lutein and zeaxanthin are yellow plant pigments found in leafy greens 🥬, corn 🌽, and egg yolks 🥚. They build up in the macula — the central part of the retina — acting like “natural sunglasses” 🕶️ by filtering blue light and supporting visual function.

⚗️ Molecular & Chemical IDs

• 🧪 Lutein CAS: 127-40-2
• 🧪 Zeaxanthin CAS: 144-68-3
• 🔄 Properties: Fat-soluble; circulate with lipoproteins

⚡ Absorption & Bioavailability

✅ Enhanced by

• Dietary fat (e.g., oils, avocado 🥑, nuts)
• Egg yolk matrix 🥚
• Light cooking or pureeing greens

❌ Reduced by

• Very low-fat diets
• Fat-malabsorption conditions

🇦🇺 Australian NRVs

📊 No RDI/AI is set for lutein or zeaxanthin. Dietary intake is encouraged via carotenoid-rich foods such as leafy greens, corn, and egg yolks.

🍳 Food Sources

• 🥬 Leafy greens: spinach, kale, silverbeet
• 🌽 Corn
• 🥚 Egg yolks

💡 Tip: Eat greens with avocado or olive oil to boost absorption.

🧪 Testing & Monitoring

• 🔬 Research use: Macular pigment optical density (measured in eye clinics).
• Serum carotenoid levels (mainly in research).
• ❌ Not a routine pathology test in Australia.

🔗 Interactions

• ⚖️ Compete with other carotenoids (β-carotene, lycopene) for absorption.
• 🥗 Overall dietary pattern influences uptake balance.

📊 Evidence Snapshot

• 🔬✅ Established: Accumulate in the macula; filter blue light; act as antioxidants.
• 🧪⚖️ Mixed evidence: Supplementation shows variable benefits — strongest where baseline diet is low (e.g., AREDS2 trial).