Bladderwrack
Bladderwrack in Prostadine: Claims, Iodine and Metals
Bladderwrack is a brown seaweed, listed fourth among Prostadine's nine ingredients with no amount printed. The sales page says it “Strengthens prostate cells” and “Supports healthy libido levels”. We found no human trial of bladderwrack for either. It carries iodine and can carry arsenic, cadmium and lead, so thyroid patients should ask a doctor first.
Written by the Prostadine label deskUpdated
The ingredient01
What is bladderwrack?
Bladderwrack is a brown seaweed, Fucus vesiculosus, named for the little air bladders on its fronds.
Bladderwrack grows on cold, rocky shores. It was dried and used in old thyroid remedies because it holds iodine. It is also sold as kelp in some products, and the two names overlap (LactMed, Seaweed (kelp, bladderwrack)).
Prostadine lists it as bladderwrack powder, fourth in the sales page order (Prostadine sales page). The page does not say how much is in 2 ml, where it was harvested or how the powder was tested.
| Name on the sales page | Bladderwrack Powder |
|---|---|
| What it is | Fucus vesiculosus brown seaweed |
| Group | Sea vegetables |
| Amount in 2 ml of Prostadine | Not printed |
| What the sales page claims | “Strengthens prostate cells” / “Supports healthy libido levels” |
| What the evidence says | No reliable human evidence for prostate or libido |
| Known or traditional use | Brown seaweed used in old thyroid remedies |
| Main caution | Iodine and heavy metals; may affect the thyroid. |
The claims02
Does bladderwrack support libido, as the sales page says?
No study we found shows that. The claim has no named source.
The sales page says bladderwrack “Supports healthy libido levels” (Prostadine sales page). It cites no trial. Our search found no human study of bladderwrack and sexual desire.
A review of sexual-function supplements found that none of Prostadine's nine ingredients is among those with some evidence (Petre et al., Nutrients 2023 (ED supplements)). Libido also shifts with age, sleep, stress, mood, medicines and health, so a supplement is rarely the whole story. Testosterone drifts down about 1% a year with age (Feldman et al., MMAS, JCEM 2002).
The same page says bladderwrack “Strengthens prostate cells”. No human trial measures that either. Cells in a dish are not a prostate in a man.
- 04
Bladderwrack Powder
Fucus vesiculosus brown seaweedThe page claims“Strengthens prostate cells”
“Supports healthy libido levels”The evidence saysNo reliable human evidence for prostate or libido. (LactMed, Seaweed (kelp, bladderwrack)) (Hwang et al., Korean seaweed metals 2010)
Not printedHow much is in 2 ml
Claims as printed on the sales page (Prostadine sales page). Photos are the vendor's pictures of each raw ingredient, not of the liquid. Health claims need competent and reliable evidence, ideally trials of the product itself (FTC, Health Products Compliance Guidance).
Thyroid03
Does bladderwrack affect the thyroid?
It can, because it holds iodine, and the thyroid needs iodine to make its hormones.
Bladderwrack and kelp both contain iodine (LactMed, Seaweed (kelp, bladderwrack)). Adults need 150 mcg a day and should stay under 1,100 mcg (NIH ODS, Iodine). Too much can cause goiter, an underactive thyroid or an overactive one.
Seaweed supplements vary widely. In one lab study of 96 seaweed products, daily doses of supplements held 5 to 5,600 mcg of iodine, and labels were often wrong (Aakre et al., Food Nutr Res 2021). A woman with no thyroid disease developed hyperthyroidism after kelp tablets, in one case report (Gherbon et al., Medicine 2019).
Bladderwrack is one of four seaweeds, and iodine is also listed on its own. The total per 2 ml is not printed. Read the iodine page if you have thyroid disease or take thyroid medicine.
Metals04
Can bladderwrack contain arsenic or cadmium?
Yes. Brown seaweeds can carry arsenic, cadmium and lead.
The LactMed record says bladderwrack and kelp can contain heavy metals such as arsenic, cadmium and lead (LactMed, Seaweed (kelp, bladderwrack)). Brown seaweeds had the highest arsenic of 25 seaweeds tested, mostly in less harmful organic forms (Yu et al., Food Chem Toxicol 2024).
Context helps. A Korean study of 426 dried seaweed samples found low risk at normal food portions (Hwang et al., Korean seaweed metals 2010). A daily supplement is a different habit, and Prostadine publishes no metals test.
| Question | Finding |
|---|---|
| Iodine | Present; amount in Prostadine not printed (LactMed, Seaweed (kelp, bladderwrack)) |
| Arsenic, cadmium, lead | Can be present in brown seaweeds (LactMed, Seaweed (kelp, bladderwrack)) (Yu et al., Food Chem Toxicol 2024) |
| Food portions | Low risk for three metals in Korean samples (Hwang et al., Korean seaweed metals 2010) |
| Prostadine test report | None published |
Prostadine: from $49 a bottle2 fl oz (60 mL) dropper · 2, 3 or 6 bottles · 60-day money-back guarantee
See packsKelp or bladderwrack05
How is bladderwrack different from kelp?
Both are brown seaweeds, but they are different plants, and Prostadine lists them separately.
Kelp usually means large brown seaweeds such as Laminaria. Bladderwrack is Fucus, a smaller wrack with air sacs. Prostadine lists kelp powder third and bladderwrack powder fourth (Prostadine sales page).
Some records use the terms loosely, so labels can mislead (LactMed, Seaweed (kelp, bladderwrack)). Both add iodine. The nori, wakame and kelp page covers the other three seaweeds.
Medicines06
Is bladderwrack safe with blood thinners?
We found no source that settles it, so ask your pharmacist before combining them.
None of our sources tests bladderwrack with warfarin. Herbal products can interact with medicines, and caution is greatest for drugs with a narrow safety margin, such as warfarin (NCCIH, Herb-Drug Interactions). Supplements can also affect lab tests and surgery (FDA 101: Dietary Supplements).
Thyroid medicine is the clearer concern. High-dose iodine can add to the effect of antithyroid drugs (NIH ODS, Iodine). Keep taking every prescription, and show the bottle to your doctor, as the sales page itself advises (Prostadine sales page).
Research07
Is there any study of bladderwrack on the prostate?
We found no human trial of bladderwrack for the prostate, bladder or libido.
Search results show lab work and food-safety papers, not trials in men with urinary symptoms. Prostadine itself has no published trial either. The strongest prostate research among its nine ingredients is for saw palmetto, which did no better than placebo for BPH symptoms (Bent et al., NEJM 2006).
That means a buyer has no outcome data for bladderwrack, only a sales claim, an iodine question and a metals question. Weigh those before you order.
FAQ08
Bladderwrack questions, answered
What is bladderwrack?
Bladderwrack is a brown seaweed, Fucus vesiculosus, used in old thyroid remedies because it holds iodine. Prostadine lists bladderwrack powder fourth of nine ingredients and prints no amount (Prostadine sales page) (LactMed, Seaweed (kelp, bladderwrack)).
Does bladderwrack support libido, as the page says?
We found no human study showing it. The sales page says it “Supports healthy libido levels” but names no trial (Prostadine sales page). A review found none of Prostadine's nine ingredients among those with some evidence for sexual function (Petre et al., Nutrients 2023 (ED supplements)).
Does bladderwrack affect the thyroid?
It can, because it contains iodine, and iodine controls thyroid hormone. Too much may cause goiter or an under- or overactive thyroid (NIH ODS, Iodine) (LactMed, Seaweed (kelp, bladderwrack)). People with thyroid disease or thyroid medicine should ask a doctor first.
Can bladderwrack contain arsenic or cadmium?
Yes. Bladderwrack and kelp can contain arsenic, cadmium and lead (LactMed, Seaweed (kelp, bladderwrack)), and brown seaweeds carry the most arsenic (Yu et al., Food Chem Toxicol 2024). Prostadine publishes no metals test, so ask the order desk for a third-party report.
Is bladderwrack safe with blood thinners?
No source we found tests it with warfarin. Herbal products can interact with narrow-margin drugs such as warfarin (NCCIH, Herb-Drug Interactions), so ask your pharmacist before combining them. Never stop a prescription because of a supplement.
How is bladderwrack different from kelp?
Kelp usually means large brown seaweeds such as Laminaria, while bladderwrack is Fucus, a smaller wrack with air bladders. Both add iodine, and records sometimes use the names loosely (LactMed, Seaweed (kelp, bladderwrack)). Prostadine lists them as separate ingredients (Prostadine sales page).
Is there any study of bladderwrack on the prostate?
We found no human trial of bladderwrack for the prostate, bladder or libido. The sales claim “Strengthens prostate cells” has no named source (Prostadine sales page). Saw palmetto is the best-studied ingredient in the formula, and it did no better than placebo for BPH (Bent et al., NEJM 2006).
Who wrote this09
Written and reviewed by
Pages built from the bottle front, the sales page and linked NIH, FDA, FTC and peer-reviewed sources.
Last updated . See our editorial standards and how we check reviews. This website is run by Goprostadine, a USA Authorized Prostadine Retailer, not by the manufacturer. We are paid when you buy through our order links.
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