Prostadine Review: Ingredients, Doses and Whether It Works
Liquid prostate drops built around seaweed extracts and saw palmetto
Writes everything on Better Vitality · Last reviewed October 4, 2026
No medical background. Every health claim on this site is sourced to a study, guideline or regulator you can open and read yourself, and nothing here is medical advice.
Our verdict
Prostadine is the most searched prostate supplement on the market, but its formula leans on kelp, wakame, nori and bladderwrack, ingredients with almost no prostate-specific research. Saw palmetto is in there, but at an undisclosed dose in a 2 ml dropper it is unlikely to reach the 320 mg daily amount used in trials. If you want the ingredients with the best evidence, look at beta-sitosterol or rye grass pollen instead. Saw palmetto on its own did no better than placebo in the 2023 Cochrane review, even at full trial doses.
- Best for
- Men who dislike swallowing capsules and want a low-commitment liquid to try alongside the basics (fluid timing, less caffeine, pelvic floor work).
- Skip it if
- You have a thyroid condition (four of the nine ingredients are seaweeds, three of them (kelp, bladderwrack and wakame) rich in iodine, plus added iodine), or you want a product whose label tells you exactly how much of each active you get.
Form
Liquid drops, 2 ml (one full dropper) daily
Price
Not disclosed outside the order form. See 'What we could not verify' below.
Guarantee
60-day money-back guarantee
Ingredients: label dose versus trial dose
This is the table every supplement review should have and almost none do. The middle column is what the label discloses. The right column is what the human trials used. When the label says nothing, we say so.
| Ingredient | On the label | Dose used in trials | Evidence |
|---|---|---|---|
| Nori yaki extract powder Edible seaweed. Contains some iodine, far less than kelp; no human data on urinary symptoms. | Not disclosed (proprietary blend) | No prostate trials | None evidence |
| Wakame extract Contains fucoxanthin, studied for weight and metabolic markers, not for BPH. | Not disclosed | No prostate trials | None evidence |
| Kelp powder Very high in iodine, and kelp products vary enormously. Excess iodine can push the thyroid either way, overactive or underactive, even in people without known thyroid disease. Seaweed supplements have also been found to contain arsenic and lead. | Not disclosed | No prostate trials | None evidence |
| Bladderwrack powder Another iodine-rich seaweed. Traditional use only. | Not disclosed | No prostate trials | None evidence |
| Saw palmetto The one ingredient with a real trial history, and that history is negative: the 2023 Cochrane review found little to no benefit over placebo. A 2 ml liquid serving is unlikely to carry the 320 mg of lipid extract used in trials, and the label does not say. | Not disclosed | 320 mg/day of a standardized lipid extract | Weak evidence |
| Pomegranate extract Antioxidant. The prostate research is in cancer, not urinary symptoms, and even there a placebo-controlled trial found no effect on PSA doubling time. | Not disclosed | Studied mainly for PSA doubling time in prostate cancer, not BPH | None evidence |
| Iodine Added on top of four iodine-rich seaweeds. Total iodine per serving is not stated anywhere on the vendor page. | Not disclosed | Adult RDA 150 mcg; upper limit 1,100 mcg | None evidence |
| Shilajit Small trials on testosterone and exercise fatigue in men, using purified extracts; raw shilajit varies in metal content, and the purity here is unknown. Nothing on prostate size or flow. | Not disclosed | 250 to 500 mg/day in testosterone and fatigue trials | Weak evidence |
| Neem Antimicrobial in lab studies. No human urinary data. | Not disclosed | No prostate trials | None evidence |
What is good
- Liquid format is easy to take and easy to stop
- Contains saw palmetto, the most-studied herbal for urinary symptoms, though the best trials found it no better than placebo
- 60-day refund window stated on the vendor page
What is not
- No ingredient doses disclosed at all
- Five of nine ingredients are seaweeds or iodine with no BPH research
- Iodine load is unknown, which matters if you have any thyroid history
- Price per month is high for what is mostly seaweed
What people say on forums
Themes from public discussion on Reddit and similar forums, paraphrased. Anecdotes, not evidence, but useful for setting expectations.
- Several users report no noticeable change after a few weeks
- Most positive reviews online sit on sites that also sell it
- Frequent confusion about whether it is a drug; it is a supplement and not FDA-evaluated
Frequently asked questions
- Does Prostadine really shrink the prostate?
- No published trial has tested Prostadine itself. Of its ingredients, only saw palmetto has been tested on the prostate: a one-year trial found it did not change prostate size more than placebo, and the 2023 Cochrane review found little to no benefit on symptoms.
- Is Prostadine safe to take with tamsulosin?
- There is no known direct interaction, but nobody has studied the combination. The iodine content is the bigger unknown. Show the label to your pharmacist, especially if you take thyroid medication (levothyroxine or methimazole), lithium, amiodarone or a blood thinner. Iodine and lithium together can cause an underactive thyroid.
- Where should I buy it?
- Only from the vendor's own site. Forum users repeatedly report counterfeit supplements sold under popular brand names on Amazon, and the refund guarantee only applies to direct purchases.
Decided it is worth a try? Buy only from the official site so the refund guarantee applies.
Related reading
- Prostate supplement ingredients ranked by trial evidence and dose →
- Tamsulosin alternatives, ranked by how much evidence sits behind them →
- How to stop taking tamsulosin safely →
- Rye grass pollen: the one with the nocturia data →
- Beta-sitosterol: better flow and fewer symptoms against placebo →
- Saw palmetto: the evidence →
- All supplement reviews →
Buying the ingredients on their own
Every review on this site ends up at the same question: could you get the same ingredients at a dose you can actually read? Where Prostadine contains something worth having, here is the single-ingredient version.
- Saw palmettoCheck on Amazon
NOW Saw Palmetto Extract 320 mg with pumpkin seed oil, 90 softgels
As an Amazon Associate we earn from qualifying purchases, at no extra cost to you. Buy from the brand or an authorised seller; forum users report counterfeit supplements from third-party sellers.
What we could not verify
- The price. The vendor's page builds its pricing table in the browser rather than serving it in the page, so we could not read a per-bottle figure the way we did for the other two products on this site. Check the order page before you buy.
- We have not taken this product. Nothing here is a test report; it is a reading of the label against the published trials, plus the vendor's own claims.
- The dose of every ingredient. Prostadine lists its formula without amounts, so the dose column in the table above is what the trials used, not what is in the bottle.
Sources
- Franco JV et al. Serenoa repens for the treatment of lower urinary tract symptoms due to benign prostatic enlargement. Cochrane Database Syst Rev 2023 (27 studies; little to no benefit)
- Bent S et al. Saw palmetto for benign prostatic hyperplasia. N Engl J Med 2006 (one year; no change in prostate size)
- Pantuck AJ et al. A randomized, double-blind, placebo-controlled study of the effects of pomegranate extract on rising PSA levels in men following primary therapy for prostate cancer. Prostate Cancer Prostatic Dis 2015
- Teas J et al. Variability of iodine content in common commercially available edible seaweeds. Thyroid 2004
- Aakre I et al. Commercially available kelp and seaweed products: valuable iodine source or risk of excess intake? Food Nutr Res 2021
- Gherbon A et al. Transient hyperthyroidism following the ingestion of complementary medications containing kelp seaweed: a case report. Medicine 2019
- Shopsin B et al. Iodine and lithium-induced hypothyroidism: documentation of synergism. Am J Med 1973
- Reboredo FH et al. Elemental composition of algae-based supplements by energy dispersive X-ray fluorescence. Plants 2021 (arsenic and lead)
This article is for information only and is not medical advice. Statements about supplements have not been evaluated by the FDA. Do not start, stop or combine supplements with prescription medication without talking to your doctor or pharmacist. If you cannot pass urine, or have chest pain, confusion or fainting, seek emergency care.
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