Horsewood Side Effects: What to Know Before You Start
Horsewood side effects are best checked ingredient by ingredient, and each amount is small.
Horny goat weed has heart-rhythm case reports and drug interactions. If you take nitrates or blood-pressure drugs, ask a doctor first, and buy only from the official seller.
To see if it suits you, read who Horsewood is for.
Is Horsewood safe? What is known and what is not
Horsewood has not been tested for safety as a finished product. No trial has measured how often it causes side effects. What we can check is each of the seven ingredients on the label.
The label prints every amount, and all of them are small. That lowers some risks but does not remove them. Several ingredients have little human safety data at all.
| Ingredient | Amount per serving | What safety sources say | Source |
|---|---|---|---|
| Horny goat weed (epimedium) | 8 mg, 10:1 extract | Heart-rhythm case reports; drug interactions, incl. aromatase inhibitors. Icariin caused stomach upset at 1,680 mg a day. | (MSKCC, 2023) (Brown et al., 2019) |
| Tongkat ali | 10 mg, 100:1 extract | Trials ran 4 to 12 weeks at 100 to 600 mg a day. No side-effect figure in our sources. | (Leisegang et al., 2022) |
| Saw palmetto | 20 mg | Generally well tolerated in studies. | (NCCIH, 2025) |
| Nettle leaf | 20 mg | Unlikely to harm the liver. | (LiverTox, 2023) |
| Boron amino acid chelate | 20 mg (elemental not stated) | Adult upper limit is 20 mg of elemental boron a day. | (NIH ODS, 2022) |
| Wild yam | 20 mg | The body does not turn its diosgenin into hormones. No safety figure for men. | (MSKCC, 2022) |
| Sarsaparilla | 20 mg | Limited clinical data. It cannot be recommended for any use. | (Drugs.com, 2026) |
A thin record is not proof of safety. It only means nobody has studied the question well. Our ingredients page explains what each herb is for.
Horny goat weed in Horsewood: heart rhythm and drug interactions
Horny goat weed is the ingredient in Horsewood with the clearest safety flags. Memorial Sloan Kettering lists case reports of heart-rhythm problems linked to epimedium, the plant behind it. It also lists interactions with prescription drugs (MSKCC, 2023).
One named interaction is with aromatase inhibitors. These are drugs some men and women take to lower estrogen. The same source says any benefit for sexual function is unproven.
The label gives 8 mg of a 10:1 extract. It does not state the icariin content. In a 5-day human study, icariin was barely absorbed, and the top dose of 1,680 mg a day caused stomach upset (Brown et al., 2019).
Horsewood with nitrates and blood-pressure medicines
Men on nitrates or blood-pressure medicine should talk to a doctor before taking Horsewood. Nitrates treat chest pain, and some products in this category can make blood pressure drop fast. Your doctor knows your full list of medicines.
Bring the bottle to your visit. The label panel lists all seven actives and the other ingredients in one place.
Medicines to raise with your doctor
- Nitrates, such as nitroglycerin
- Blood-pressure medicines of any kind
- Heart-rhythm medicines
- Blood thinners
- Hormone therapy, including testosterone
- Aromatase inhibitors
How much boron does Horsewood add?
Horsewood lists 20 mg of boron amino acid chelate per serving. The label does not say how much elemental boron is inside that chelate. The chelate weight includes the amino acid, so the boron itself is some smaller share.
The adult upper limit is 20 mg of elemental boron a day from all sources. US adults get about 1 mg a day from food (NIH ODS, 2022). The risk comes from stacking products.
- Check other supplements for boron before you add this one.
- Multivitamins and bone or joint formulas often list it.
- Add up the elemental boron where labels state it.
- Ask a pharmacist if a label only lists a chelate weight.
Is Horsewood FDA approved?
No. The FDA does not approve dietary supplements before they go on sale (FDA, 2026). Makers, not the FDA, are responsible for safety before a product is sold (FDA, 2026).
The Horsewood label says it is made in an FDA-registered facility. Registration describes the factory. It is not a review of the capsule or its claims.
What the label promises, and what it does not
- Every active amount per serving is printed
- Made in an FDA-registered facility (the factory, not the product)
- Carries the standard FDA disclaimer
- Makes no claim that it treats any condition
Who should not take Horsewood?
Horsewood is for healthy adult men 18 and over. The label says pregnant or nursing mothers, children under 18 and anyone with a known medical condition should consult a physician first. It also says not to exceed the recommended dose.
Under 18
The label rules out children and teens. Keep the bottle out of their reach.
Heart concerns
Past heart-rhythm problems or heart medicines need a doctor's view first.
Hormone-related care
Men on hormone therapy or an aromatase inhibitor should ask before use.
Avoid animal products?
Gelatin is listed under other ingredients. Check it against your diet.
Erection problems and your heart: see a doctor before Horsewood
New or lasting erection problems can be an early sign of heart disease. A doctor can check blood pressure, blood sugar and cholesterol. A supplement like Horsewood is not a substitute for that visit.
Horsewood is a dietary supplement, not a medicine. It does not diagnose, treat, cure or prevent any disease. Get checked first, then decide about supplements with your doctor.
What to do if you get side effects on Horsewood
Stop taking Horsewood if you notice a side effect. Most mild problems, such as an upset stomach, should settle once you stop. Call your doctor if they do not.
| What you notice | What to do |
|---|---|
| Upset stomach or mild headache | Stop. Call your doctor if it lasts more than a day or two. |
| Racing, pounding or uneven heartbeat | Stop at once and call your doctor today. |
| Chest pain, fainting or trouble breathing | Call 911. |
| Swelling of the face, lips or throat | Call 911. |
| Questions about your order or a refund | Call the order desk at +1 (302) 200-3480. |
Keep the bottle so you can show the label. The refund policy explains how to return an order inside the 60-day window.
Horsewood safety: common questions
Does Horsewood cause side effects?
Horsewood has not been tested as a finished product, so no side-effect rate exists for it. Its ingredients have their own records. Horny goat weed has heart-rhythm case reports, and icariin caused stomach upset at a very high dose.
Can I take Horsewood with heart or blood-pressure medicine?
Talk to your doctor first. That applies to nitrates, blood-pressure and heart-rhythm medicines, and blood thinners.
Is Horsewood safe with an aromatase inhibitor or hormone therapy?
Ask your doctor before use. Memorial Sloan Kettering lists drug interactions for epimedium, the horny goat weed in the formula.
Is Horsewood FDA approved?
No. The FDA does not approve dietary supplements before sale. The label says Horsewood is made in an FDA-registered facility, which describes the factory.
How much boron is in Horsewood?
The label lists 20 mg of boron amino acid chelate. It does not say how much elemental boron that holds. The adult upper limit is 20 mg of elemental boron a day from all sources.
Does Horsewood contain gelatin?
Yes. Gelatin is listed under other ingredients, along with microcrystalline cellulose and magnesium stearate.
Who should not take Horsewood?
Anyone under 18, and women who are pregnant or nursing. Men with a known medical condition should ask a physician first, as the label says.
What should I do if I feel unwell on Horsewood?
Stop taking it and call your doctor. Call 911 for chest pain, a racing or uneven heartbeat, fainting or trouble breathing.
