What each ingredient is, why it's in a prostate formula, and what the research actually shows — with a plain verdict at the end of each one.
Pygeum africanum bark extract
What it is: An extract from the bark of the African cherry tree (Prunus africana), used in European phytotherapy for lower urinary tract symptoms since the 1970s.
Why it's here: Pygeum bark contains phytosterols and pentacyclic triterpenes that appear to reduce inflammatory prostaglandins in prostate tissue, which is thought to ease the swelling and irritation behind mild BPH symptoms.
What the research shows: A systematic review and meta-analysis of 18 randomized trials in 1,562 men found Pygeum users were roughly twice as likely to report symptom improvement as those on placebo, with measurable gains in urine flow. The same review flagged the trials as short, inconsistently designed, and rarely using standardized outcome measures.
Verdict: Reasonable trial evidence for modest symptom relief in mild BPH; not proof it shrinks the prostate or replaces medical treatment.
Beta-sitosterol (marketed as "Lipophytol")
What it is: A plant sterol chemically similar to cholesterol, found naturally in saw palmetto, pygeum, rye grass pollen, and stinging nettle — here isolated and concentrated.
Why it's here: Beta-sitosterol partially inhibits 5-alpha reductase, the same enzyme targeted by prescription drugs like finasteride, and also appears to relax prostate smooth muscle.
What the research shows: A Cochrane review of four placebo-controlled trials in 519 men found beta-sitosterol improved urinary symptom scores and flow measures, was well tolerated, but didn't reduce prostate size, with long-term effects still unclear.
Verdict: One of the better-supported natural options for BPH symptoms — the caveat is TC24 doesn't publish the exact dose, so it's hard to compare against the 60–130 mg used in trials.
Boron
What it is: A trace mineral found in fruits, nuts, and leafy vegetables, involved in how the body metabolizes hormones and minerals.
Why it's here: Boron is thought to lower sex hormone-binding globulin, which could raise free testosterone, and some epidemiological data associates higher dietary boron intake with lower prostate cancer rates.
What the research shows: Results are mixed. A small 2011 trial found a short-term rise in free testosterone after boron supplementation, but an earlier 1993 study in male bodybuilders found no change in testosterone, strength, or muscle mass. The prostate-cancer link comes from population-level, correlational studies, not controlled human trials aimed at BPH.
Verdict: Promising but preliminary — there is no dedicated human trial yet showing boron improves BPH symptoms specifically.
Myrciaria jaboticaba
What it is: A Brazilian berry, related to guava, whose skin is unusually concentrated in anthocyanins and polyphenols — the same class of antioxidants found in blueberries and dark grapes.
Why it's here: Chronic low-grade oxidative stress is one proposed contributor to prostate tissue changes over time, so an antioxidant-dense ingredient fits the formula's "reduce inflammation" angle.
What the research shows: Most jaboticaba research is food-science or in-vitro work confirming its antioxidant content; it hasn't been tested in human trials for prostate or urinary outcomes specifically.
Verdict: Plausible supporting ingredient on general antioxidant grounds, but not one with prostate-specific human data behind it yet.