The Science

What is AREDS 2 — and why are these the most-studied eye nutrients?

A plain-English explainer of the National Eye Institute's AREDS 2 formula, how it differs from a multivitamin, and what the research actually says.

Lutein-rich foods and a glass beaker on cream linen — visualising the AREDS 2 nutrient combination.

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The short version

If you've spent any time researching eye supplements, you've seen the letters AREDS 2 stamped on every other label. The label is a shorthand for a specific combination of nutrients that was studied in the world's largest eye-nutrition trial — the Age-Related Eye Disease Study 2, run by the U.S. National Eye Institute and published in 2013. It looked at how a particular daily combination of antioxidants and zinc behaved in a specific older population over five years.

Today the formula is freely available, has been replicated by dozens of brands, and is the de-facto reference point for "eye vitamins" in pharmacies and online. What it actually contains — and what the science does and does not say — is worth understanding before you spend $30 to $90 a month on it.

This article walks through it. No exaggerated claims; just the facts.

Where the AREDS 2 formula came from

The first AREDS trial began in 1992. It enrolled around 4,750 adults and tested a formula of vitamin C (500 mg), vitamin E (400 IU), zinc (80 mg as zinc oxide, with 2 mg copper to balance it) and beta-carotene (15 mg). After about six years, the original study reported a modest difference in the rate at which intermediate cases progressed within the study population. The result was widely discussed but also widely caveated — the formula was high-dose, and the beta-carotene dose was later linked to other risks in smokers.

Two decades later, AREDS 2 set out to refine the original recipe. The headline change: beta-carotene was removed and replaced with lutein and zeaxanthin — two carotenoids that naturally accumulate in the macula of the eye. The zinc dose was also tested at a lower amount (25 mg) alongside the original 80 mg. The omega-3 fatty acids EPA and DHA were tested separately and did not show an added effect over and above the antioxidants and carotenoids.

The result is the formula you see on labels today: lutein, zeaxanthin, vitamin C, vitamin E, zinc, copper. It is the most-studied combination in the eye-supplement space, and it is what *AREDS 2-inspired* products like ours are built around.

Where it acts

What the eye actually does with these nutrients

Cross-section of the human eye showing the macula

The reason these particular nutrients matter is that the eye is a high-oxygen, high-light organ. The retina sits at the back of the eye and contains the macula — a small but dense region responsible for sharp central vision. The macula naturally concentrates two yellow pigments: lutein and zeaxanthin. Both are carotenoids that you can only obtain from food (your body cannot make them).

Vitamin C and vitamin E are the body's best-studied antioxidants and contribute to the protection of cells from oxidative stress — a claim authorised by the European Food Safety Authority (EFSA). Zinc contributes to the maintenance of normal vision, also an EFSA-authorised claim. Copper is included alongside zinc because high zinc intake can lower copper absorption, and the AREDS protocol added a small amount of copper to balance that.

None of this means the formula is a treatment for any condition. It means the nutrients are well-characterised, and they are the ones that the largest eye-nutrition trial focused on. Inviting them into your daily routine is a reasonable, evidence-aware choice for adults thinking about long-term eye health.

Source: AREDS2 Research Group, JAMA Ophthalmology

The six nutrients, one by one

Lutein (10 mg). A yellow carotenoid found in spinach, kale, egg yolks and corn. It accumulates in the macula. The typical Western diet provides 1–3 mg/day; AREDS 2 used 10 mg.

Zeaxanthin (2 mg). A close cousin of lutein, found in goji berries, corn, and orange peppers. The macula contains both pigments in roughly a 5:1 lutein-to-zeaxanthin ratio. AREDS 2 matched that ratio.

Vitamin C (250 mg in our formula; 500 mg in the original AREDS 2). Water-soluble antioxidant. The EFSA-authorised claim is: *"Vitamin C contributes to the protection of cells from oxidative stress."* Excess vitamin C is excreted, so a smaller dose can be sufficient when paired with a daily diet that already includes fruit and vegetables.

Vitamin E (200 IU as α-tocopherol). Fat-soluble antioxidant. The EFSA-authorised claim is the same as vitamin C: *"Vitamin E contributes to the protection of cells from oxidative stress."*

Zinc (25 mg as zinc oxide). Essential mineral. The EFSA-authorised claim is: *"Zinc contributes to the maintenance of normal vision."* The original AREDS used 80 mg of zinc; AREDS 2 found that 25 mg performed similarly for most participants and is what most modern formulas use today.

Copper (2 mg as cupric oxide). Included to balance the higher zinc intake. Not an active anti-oxidant in this context — just a buffer.

AREDS, AREDS 2, and a standard multivitamin — quick comparison

These three formulas are often confused. Here is what differs.

Formula	Lutein	Zeaxanthin	Vitamin C	Vitamin E	Zinc	Beta-carotene
Original AREDS (1996)	—	—	500 mg	400 IU	80 mg	15 mg
AREDS 2 (2013)	10 mg	2 mg	500 mg	400 IU	25-80 mg	removed
Happy Eye AREDS 2 Daily	10 mg	2 mg	250 mg	200 IU	25 mg	none
Standard multivitamin	trace or none	trace or none	60-90 mg	15-30 IU	10-15 mg	varies

How nutrients reach the macula

Frequently asked questions

Is AREDS 2 a drug?

No. AREDS 2 refers to a specific *nutrient combination* — vitamin C, vitamin E, zinc, copper, lutein and zeaxanthin — that was investigated in a 2013 clinical trial run by the U.S. National Eye Institute. Supplements containing this combination are food supplements, not medicines.

Are AREDS 2 supplements suitable for everyone?

These are intended for adults aged 18 and above. As with any food supplement, consult your physician or qualified healthcare provider before starting if you are pregnant, nursing, taking medication, or have a medical condition.

Why do some AREDS 2 supplements use 80 mg of zinc and others 25 mg?

The original AREDS used 80 mg. AREDS 2 tested both 80 mg and 25 mg and found similar performance for most participants. Most modern AREDS 2-inspired formulas — including ours — use 25 mg, which is gentler on the stomach and reduces the risk of zinc–copper imbalance.

Can I get these nutrients from food instead?

Yes. Lutein and zeaxanthin are found in kale, spinach, corn, egg yolks, and orange peppers. Vitamin C is abundant in citrus, peppers and berries. Vitamin E is in seeds, nuts and vegetable oils. Zinc is in red meat, shellfish and legumes. A supplement is a convenience layer on top of a varied diet — not a replacement for it. See our Foods vs Supplements comparison.

How long does a bottle last?

Each Happy Eye bottle contains 120 softgels — a 60-day supply at the recommended dose of two softgels per day.

Where do you ship?

We ship worldwide. Standard delivery is 7–15 business days; express is 3–7. Free shipping on orders over $49. See our Shipping Policy.

What this product is — and is not

Happy Eye AREDS 2 Daily is a food supplement, not a medicine. It does not diagnose, treat, cure or prevent any disease. What it does is give you a daily dose of the nutrients investigated in AREDS 2 in a single softgel format, at the dosages most commonly used in modern AREDS 2-inspired formulas, without paying clinic-pharmacy prices.

Zinc contributes to the maintenance of normal vision. Vitamin C and vitamin E contribute to the protection of cells from oxidative stress. Lutein and zeaxanthin are carotenoids that occur naturally in the macula of the eye.

If you want to read more, two good next stops: