Lycopene benefits: what the research does and doesn't show

The evidence doesn't support lycopene supplements as a treatment for prostate cancer, as a way to lower blood pressure or cholesterol, or as protection for eyesight. The most substantial data linking lycopene to a decreased prostate cancer risk comes from diet, not supplements, and is observational — it shows an association, not a tested effect of taking a pill.

What the evidence doesn't support

It doesn't support lycopene, in any form or dose, as a treatment for existing prostate cancer: the one meta-analysis of actual supplementation trials in men already diagnosed found no significant overall effect on PSA. It doesn't support a claim that supplementing with lycopene lowers cardiovascular risk — a pooled analysis of 34 randomized trials found no significant effect on blood pressure, cholesterol, blood sugar or inflammatory markers. Our search turned up no randomized controlled trial testing lycopene supplements against an eye-disease outcome such as macular degeneration; the carotenoids most studied for that specific use are lutein and zeaxanthin, not lycopene, so there's nothing dose-matched to report here either way. And the diet-based association between eating more tomatoes and fewer prostate cancer diagnoses is not the same claim as "a lycopene supplement reduces cancer risk" — nobody has run the trial that would show that directly.

What the trials found

A 2017 systematic review and dose-response meta-analysis pooled 42 studies covering 43,851 cases of prostate cancer among 692,012 participants, comparing people's dietary lycopene intake and their blood (circulating) lycopene levels against their prostate cancer risk. Both measures were associated with modestly lower risk (relative risk 0.88 for each), and the dose-response analysis found roughly a 1% reduction in risk for every additional 2 mg of dietary lycopene. There was no association with advanced or aggressive prostate cancer specifically, only a non-significant trend. This is observational evidence: it compares people who happened to eat more tomato-based foods (or who had higher blood lycopene, which reflects diet) against those who ate less, over years, and it cannot separate lycopene from everything else that comes with a tomato-heavy diet. It says nothing about what taking an isolated lycopene supplement would do.

The closest thing to a direct test of supplementation exists in men already diagnosed with non-metastatic prostate cancer. A 2021 meta-analysis pooled six randomized controlled trials that gave these men lycopene supplements and measured PSA, a blood marker doctors track in prostate cancer. Overall, lycopene supplementation had no significant effect on PSA (weighted mean difference -0.60 µg/L, 95% CI -2.01 to 0.81). A subgroup of men who started with higher baseline PSA (≥6.5 µg/L) did show a significant reduction, but a formal dose-response analysis found no significant relationship between how much lycopene a trial used and the result, and duration of treatment didn't change the outcome either. This is a null result on the primary question, with one subgroup finding that needs its own confirmation before it means anything on its own.

A 2023 meta-analysis pooled 34 randomized controlled trials testing lycopene or tomato-based products against cardiovascular risk factors: triglycerides, total cholesterol, LDL, HDL, fasting blood glucose, systolic and diastolic blood pressure, inflammatory markers (CRP, IL-6, TNF-α, ICAM-1), body weight and BMI. None of those showed a significant effect. The one significant finding across the 34 trials was a reduction in malondialdehyde, a laboratory marker of oxidative stress — described by the study authors as a potential benefit for oxidative stress specifically, not a change in any of the standard cardiovascular numbers a doctor would track.

A smaller 2023 randomized, double-blind trial gave 80 adults with metabolic syndrome either 20 mg a day of an encapsulated lycopene formulation or a placebo for 8 weeks. The lycopene group showed a significant reduction in C-reactive protein and in a combined pro-oxidant/antioxidant balance marker, with no significant change in liver enzymes (ALT, AST, ALP) in either group. That CRP finding sits next to the larger 34-trial pooled result above, which found no significant effect on inflammatory markers overall — one 80-person trial in a specific population doesn't overturn a null result from a much larger pooled analysis, but it's a data point worth reporting rather than leaving out.

The one clearly positive finding in this set comes from a 2005 trial in healthy adults, comparing synthetic lycopene, a tomato extract (Lyc-o-Mato) and a tomato-based drink, each providing about 10 mg of lycopene a day. After 12 weeks, all three groups showed less UV-induced skin reddening than they had at the start: 25% less in the synthetic lycopene group, and 38-48% less in the two whole-tomato-extract groups, which also raised blood levels of two additional tomato carotenoids (phytofluene and phytoene) that may have contributed. This trial compared each group's own before-and-after response rather than against a separate no-lycopene placebo arm, which is a real limit on how much weight the result can carry, but the dose (about 10 mg a day) is close to what a standard consumer supplement actually provides, which isn't true of most of the studies above.

Study	Design	Population / dose	Finding
Rowles et al., 2017	Meta-analysis, 42 observational studies	692,012 people; dietary & blood lycopene	Higher intake associated with decreased prostate cancer risk (RR 0.88); no association with advanced disease
Sadeghian et al., 2021	Meta-analysis, 6 RCTs	Men with non-metastatic prostate cancer	No significant overall effect on PSA
Zamani et al., 2023	Meta-analysis, 34 RCTs	Mixed adult populations	No effect on blood pressure, lipids, glucose, inflammation, weight; reduced oxidative stress marker only
Mirahmadi et al., 2023	RCT, n=80	Adults with metabolic syndrome, 20 mg/day, 8 weeks	Reduced CRP and oxidative stress marker; no change in liver enzymes
Aust et al., 2005	RCT, before/after comparison	Healthy adults, ~10 mg/day, 12 weeks	Less UV-induced skin reddening in all three lycopene-source groups

Questions people ask

Does lycopene lower PSA?

The most direct evidence available — a meta-analysis of six randomized trials in men already diagnosed with non-metastatic prostate cancer — found no significant overall effect on PSA. A subgroup with higher starting PSA showed a reduction, but that finding hasn't been confirmed as a standalone result, and dose didn't predict the outcome.

Is lycopene good for the prostate?

Diet-based observational studies link higher lycopene intake to a modestly decreased prostate cancer risk, but that's an association from eating patterns over years, not a tested effect of a supplement. The one meta-analysis of actual lycopene supplementation trials, in men already diagnosed with prostate cancer, found no significant effect on PSA. Those are two different questions with two different answers.

Is lycopene good for eyes?

We didn't find a randomized controlled trial testing lycopene supplementation against an eye-disease outcome. The carotenoids with trial evidence for eye health are lutein and zeaxanthin, not lycopene.

Is lycopene good for kidneys?

We found no dedicated human trial testing lycopene supplementation against a kidney function outcome. If you have kidney disease, talk to your doctor before adding any new supplement, since the kidneys are involved in clearing many compounds from the body.

Does lycopene help with cholesterol or blood pressure?

A 2023 meta-analysis of 34 randomized trials found no significant effect of lycopene or tomato products on triglycerides, total or LDL/HDL cholesterol, fasting blood glucose, or systolic or diastolic blood pressure. The one significant change across those trials was in a marker of oxidative stress, not in any of those standard numbers.

Are lycopene supplements good for prostate cancer prevention?

The evidence that exists is observational — it shows people who eat more lycopene-containing foods tend to have somewhat decreased prostate cancer rates — and observational data can't establish that taking a supplement would produce the same result. No trial has tested that question directly.

When to talk to a doctor

Anyone with prostate cancer, an elevated PSA, cardiovascular disease or kidney disease should raise it with their doctor rather than a supplement label. Lycopene is not a treatment for prostate cancer, high blood pressure, high cholesterol or any eye disease, and nothing in the evidence above supports using it as a substitute for the monitoring, screening or treatment a doctor recommends. If you're pregnant or nursing, or take prescription medication, talk to a doctor before adding any supplement.

Related reading: what is lycopene, how much lycopene to take a day, and lycopene side effects.