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Smoking status: not checked. AREDS2 Formula: what these mean for you changes depending on whether you smoke or used to, and you have not told us. That check was skipped.
Head-to-head evidence comparison — which supplement is right for you?
AREDS2 Formula vs Berberine: Berberine has the stronger overall evidence (7.5 vs 7/10); the best pick depends on your goals. Take the 60-second quiz for a pick tailored to your goals.
Berberine wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Too few graded studies
Top outcomes
Verdict
Likely helps
8 of 8 studies with measurable effects showed benefit.
Top outcomes
One AREDS2 daily regimen, usually split into two servings: vitamin C 500 mg, vitamin E 400 IU, lutein 10 mg, zeaxanthin 2 mg, zinc 80 mg (as zinc oxide) and copper 2 mg (as cupric oxide)
With meals
A product matching the AREDS2 composition exactly: vitamin C 500 mg, vitamin E 400 IU, lutein 10 mg, zeaxanthin 2 mg, zinc 80 mg, copper 2 mg
500mg 2-3x daily (1000-1500mg total)
With meals, Split into 2-3 doses
Berberine HCl capsules
and 3 more not shown
and 3 more not shown
Years — average follow-up was 6.3 years
Years
Long-term
Years
4-12 weeks
8-12 weeks
First 2 weeks
If on diabetes medications
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) · Rct · n=4203
Primary analysis was NULL: lutein/zeaxanthin HR 0.90 (98.7% CI 0.76-1.07, P=.12); DHA+EPA HR 0.97 (0.82-1.16, P=.70); both together HR 0.89 (0.75-1.06, P=.10)
A randomized, placebo-controlled, clinical trial of high-dose supplementation with vitamins C and E, beta carotene, and zinc for age-related macular degeneration and vision loss: AREDS report no. 8.
Arch Ophthalmol (2001) · Rct · n=3640
Antioxidants plus zinc vs placebo for advanced AMD: OR 0.72 (99% CI 0.52-0.98). Zinc alone OR 0.75 (0.55-1.03); antioxidants alone OR 0.80 (0.59-1.09) — neither significant on its own
Long-term Outcomes of Adding Lutein/Zeaxanthin and ω-3 Fatty Acids to the AREDS Supplements on Age-Related Macular Degeneration Progression: AREDS2 Report 28.
JAMA Ophthalmol (2022) · Cohort · n=3882
10-year lung cancer odds ratio: 1.82 (95% CI 1.06-3.12, P=.02) for beta-carotene assignment vs 1.15 (0.79-1.66, P=.46) for lutein/zeaxanthin
Clinical Efficacy of Curcumin, Resveratrol, Silymarin, and Berberine on Cardio-Metabolic Risk Factors Among Patients With Type 2 Diabetes Mellitus: A Systemic Review and Bayesian Network Meta-Analysis
Phytotherapy research : PTR (2025) · Meta analysis · n=1337
For HbA1c, silymarin was more effective than resveratrol (MD -2.08, 95%Cl -3.50 to -0.72) (P < 0.05).
Effects of berberine and barberry on selected inflammatory biomarkers in adults: A systematic review and dose-response meta-analysis of randomized clinical trials
Phytotherapy research : PTR (2023) · Meta analysis · n=1600
In addition, the non-linear analysis showed a significant lowering effect of berberine/barberry on IL-6 and TNF-α levels in doses <1000 mg/day and less than 5 weeks of intervention.
Berberine Ursodeoxycholate for the Treatment of Type 2 Diabetes: A Randomized Clinical Trial
JAMA network open (2025) · Rct · n=113
The study included 113 patients with T2D (mean [SD] age, 54.3 [10.6] years; 72 male [63.7%]) who were randomized.
The 1,000 mg point is a placebo-controlled trial of berberine 1.0 g daily for 3 months in 116 people with type 2 diabetes, where HbA1c fell from 7.5% to 6.6% and fasting glucose fell more than on placebo (PMID 18397984). The 1,500 mg point is two trials of 500 mg three times daily: one in 36 people with new type 2 diabetes where glucose fell with no significant difference from metformin in this small pilot, with transient stomach side effects in 34.5% (PMID 18442638), and a placebo-controlled pilot in 34 people with prediabetes where HbA1c fell from 6.40% to 5.43% (PMID 37679692). No trial compared doses, so the curve is flat between them and no optimal dose is set. Lower doses were not tested for glucose in any cited trial.
AI-estimated from published studies. Interpret as directional guidance.
Berberine has a higher evidence score (7.5/10 vs 7/10) and wins in 2 of 3 categories.
No documented interaction was found in the data searched. This does not establish that this exact combination is safe.
The honest tier list — proven staples vs situational vs mostly marketing. The hub the other guides feed into.
Which supplements clash with blood thinners, thyroid meds, antibiotics & more — and what to do.
What genuinely lowers LDL/triglycerides — and why "red yeast rice" is a statin in disguise.
Berberine, inositol, magnesium vs the cinnamon/chromium hype — and the med-interaction warning.
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.