Carotenoid

Best for

Protect against macular degeneration

Promising early signal · 22–50 mg/day for 52–78 weeks · 3 studies , n=21.2k

9 papers · 6 claims · 22 outcomes scored · 6 positive

Outcomes

What carotenoid actually does, by outcome

Each row is one outcome with effect size, evidence base, the dose that worked in trials, and time to first effect. Magnitude tiers come from native-unit MCID where available, Cohen's d otherwise.

Outcome Effect size Evidence Dose Weeks Rank

Protect against macular degeneration Promising early signal

Builds the protective pigment that shields your central vision from age.

3 RCTs n=21k 22–50 mg 52–78 wk #4/6

17353403·27857944·36247822

moderate

3 RCTs n=21k

22–50 mg

52–78 wk

#4 /6

Build eye-protective pigment stores Promising early signal

Raises lutein and zeaxanthin, pigments that concentrate in the retina.

2 meta-analyses n=— 5 g 4–17 wk #2/5

24920270·35571897

moderate

2 meta-analyses n=— Meta-analyzed I²=80%

5 g

4–17 wk

#2 /5

Raise protective carotenoid levels Likely modest benefit

Plant pigments reach your bloodstream and protect cells from oxidation.

1 meta-analysis n=— — 8 wk #2/7

35571897

small

1 meta-analysis n=— Meta-analyzed I²=83%

—

8 wk

#2 /7

Build firmer, denser skin Not enough research

More collagen density for skin that bounces back and holds its shape.

1 meta-analysis n=71 — — #8/8

40761858

trivial

1 meta-analysis n=71 Meta-analyzed

—

#8 /8

Sharpen visual clarity Not enough research

Pick out finer detail, edges, and text more easily.

1 RCT n=47 22 mg 78 wk #3/4

36247822

trivial

1 RCT n=47

22 mg

78 wk

#3 /4

Protect vision in retinal disease Not enough research

Keeps sight sharper and retinal signals healthier when disease threatens.

1 RCT n=47 22 mg 78 wk #3/5

36247822

trivial

1 RCT n=47

22 mg

78 wk

#3 /5

Outcome	Effect	Evidence	Dose	Weeks	Rank
Protect against macular degeneration Promising early signal	moderate	3 RCTs n=21k	22–50 mg	52–78 wk	#4/6
Build eye-protective pigment stores Promising early signal	moderate	2 meta-analyses n=— Meta-analyzed	5 g	4–17 wk	#2/5
Raise protective carotenoid levels Likely modest benefit	small	1 meta-analysis n=— Meta-analyzed	—	8 wk	#2/7
Build firmer, denser skin Not enough research	trivial	1 meta-analysis n=71 Meta-analyzed	—	—	#8/8
Sharpen visual clarity Not enough research	trivial	1 RCT n=47	22 mg	78 wk	#3/4
Protect vision in retinal disease Not enough research	trivial	1 RCT n=47	22 mg	78 wk	#3/5

Buy well

Recommended Carotenoid products

Real products that dose Carotenoid where the research does, in a clean formulation, from brands we've audited. We only list ones we'd stand behind.

Chosen for adequate Carotenoid dosing vs. the studied range, a clean formulation (grade A–C), and independent brand-quality audits. Not sponsored.

Risk profile

Adverse events and known drug interactions

Safety events

lung_cancer severe

intracerebral_hemorrhage severe

cardiovascular_disease severe

pneumonia severe

hepatotoxicity severe

hyperlipidemia moderate

common_cold mild

Drug interactions

Cyclosporine major decreases concentration

Antineoplastic Agents major decreases effect

Nelfinavir minor unknown

Co-studied with

Supplements that share evidence with carotenoid

Histidine 6 shared outcomes · d=1.84
Fishoil 4 shared outcomes · d=0.76

Sources

Generated August 14, 2026

Carotenoid

What carotenoid actually does, by outcome

Recommended Carotenoid products

Adverse events and known drug interactions

Supplements that share evidence with carotenoid

More evidence for Carotenoid

Omega-3

Vitamin A

Astaxanthin

Carotene (unspecified)

Goji

Palm Oil

Carotenoid

Recommended Carotenoid products

More evidence for Carotenoid

NewOmega-3

NewVitamin A

NewAstaxanthin

NewCarotene (unspecified)

NewGoji

NewPalm Oil

Omega-3

Vitamin A

Astaxanthin

Carotene (unspecified)

Goji

Palm Oil