Horsewood Side Effects: Herb by Herb Cautions
Written by the Horsewood Daily editorial team
Last updated · Who reviewed this page · How we write and review
Horsewood's side effects come from what is known about its herbs.
Saw palmetto may add to bleeding risk with blood thinners and before surgery, horny goat weed has case reports of fast heart rhythm, and tongkat ali has rare liver reports. Do not combine it with nitrates, ED drugs or heart drugs without your doctor.
See who Horsewood is for.
What are the side effects of Horsewood?
The exact side effects of Horsewood are unknown, because the finished product has never been tested. What we know comes from research on its single herbs.
The amounts on the label are small. Small is not the same as risk-free. Three of the seven herbs carry real safety notes, and the product category has a hidden-drug problem.
Bleeding
Saw palmetto may add to bleeding risk with blood thinners and before surgery.
Heart rhythm
Horny goat weed has case reports of a fast heart rhythm and rash.
Liver
Tongkat ali has rare reports of liver injury.
Horsewood ingredient safety table
Each Horsewood ingredient has its own safety record. The table puts the label amount next to the main safety note and the source.
Where a source says the evidence is thin, we say so. Thin evidence cuts both ways: it does not prove harm, and it does not prove safety.
| Ingredient | Label amount | Main safety note | Source |
|---|---|---|---|
| Saw palmetto berry | 20 mg | May add to bruising and bleeding risk with blood thinners; heavy bleeding in surgery reported | (MSKCC, 2023) |
| Horny goat weed | 8 mg (10:1) | Case reports of fast heart rhythm and rash; controlled trials lacking | (Drugs.com, 2026) |
| Tongkat ali | 10 mg (100:1) | Rare liver injury reports; long-term safety not well known | (NIDDK LiverTox, 2024) |
| Nettle leaf | 20 mg | Leaf is not the root studied for the prostate; evidence mixed | (NIDDK LiverTox, 2023) |
| Wild yam root | 20 mg | Does not turn into DHEA or hormones in the body | (MSKCC, 2022) |
| Sarsaparilla root | 20 mg | Not enough evidence to rate for any use | (RxList, n.d.) |
| Boron amino acid chelate | 20 mg compound | Adult upper limit is 20 mg of elemental boron a day | (NIH ODS, 2022) |
The capsule shell is gelatin. A pack badge says vegetarian, but the label lists gelatin, so Horsewood is not vegetarian.
Can the saw palmetto in Horsewood raise bleeding risk?
Yes, it may. Saw palmetto may raise bruising and bleeding risk in people on blood thinners (MSKCC, 2023). Case reports also describe heavy bleeding during surgery.
The 20 mg in Horsewood is far below the 320 mg standard dose (NCCIH, 2025). No one has measured whether a small amount changes the risk, so treat it as present.
- Tell your doctor if you take any blood thinner or anti-clotting medicine
- Tell your surgeon and dentist before any procedure
- Watch for easy bruising or bleeding that is hard to stop
Can Horsewood affect your heart or blood pressure?
It could, through its horny goat weed. Case reports describe a fast heart rhythm and rash, especially in older people with heart disease (Drugs.com, 2026). Rigorous controlled trials are lacking (NIDDK LiverTox, 2022).
Horny goat weed may also affect blood pressure. That matters most if you already take blood-pressure or heart medicines.
Signs to stop right away
- A pounding, racing or skipping heartbeat
- Chest pain or pressure
- Dizziness or fainting
- A new rash or swelling
Chest pain or fainting needs a 911 call, not a wait-and-see approach.
Can the tongkat ali in Horsewood hurt your liver?
Rarely, yes. NIH LiverTox lists rare reports of liver injury with tongkat ali and says long-term safety is not well known (NIDDK LiverTox, 2024).
Product quality is a second worry. Some tongkat ali products have been found with lead, mercury or hidden sildenafil (OPSS (DoD), 2023). That is a finding about the market, not about Horsewood.
Liver warning signs: stop and call a doctor
- Yellow skin or yellow whites of the eyes
- Dark urine or pale stools
- Pain in the upper right belly
- Unusual tiredness, nausea or loss of appetite
Which medicines can interact with Horsewood?
Several common medicines may interact with Horsewood. Blood thinners and heart medicines top the list. Supplements in general can interact with medicines (NIH ODS, 2023).
Show your full medicine list to a doctor or pharmacist before the first dose. Bring the bottle, not just the brand name.
| Medicine type | Ingredient involved | Concern |
|---|---|---|
| Blood thinners and anti-clotting medicines | Saw palmetto | May add to bleeding risk |
| Nitrates for chest pain | Hidden-drug risk in the category | Hidden ED drugs plus nitrates can drop blood pressure dangerously |
| Blood-pressure and heart medicines | Horny goat weed | May affect blood pressure; heart rhythm case reports |
| ED drugs such as sildenafil or tadalafil | Horny goat weed; category risk | Not studied together; ask your doctor |
| Hormone therapy | Tongkat ali, boron | Studied for testosterone effects; ask first |
| Other boron supplements | Boron chelate | Adds to your daily boron; upper limit 20 mg elemental |
Who should not take Horsewood?
Anyone under 18 should not take Horsewood. The label also tells pregnant or nursing women and anyone with a known medical condition to consult a physician first.
Because of the herbs inside, a wider group should get a clear yes from a doctor first. The who it is for page has the full fit guide.
- People with heart disease or heart rhythm problems
- People on blood thinners or with a surgery coming up
- People with liver disease
- Anyone taking nitrates, ED drugs or hormone therapy
- Anyone who needs a vegetarian capsule
Is Horsewood a safe way to deal with erection problems?
No. Horsewood is not a treatment for erectile dysfunction, low testosterone or any prostate condition. It is not a substitute for ED medicines.
ED can be an early warning sign of heart disease. Men who developed ED had about a 25% higher risk of later heart and blood vessel events (Thompson et al., 2005). ED may point to hardened arteries, high blood pressure or diabetes (NIDDK, 2024).
What to do if you react to Horsewood
If you react to Horsewood, stop taking it first. Then match your next step to how serious the symptom feels.
- 1
Stop the capsules
Skip the next dose. Do not push through a reaction or wait to see if it fades.
- 2
Call 911 if it is severe
Chest pain, fainting, trouble breathing or heavy bleeding needs emergency care now.
- 3
Call your doctor
Bring the bottle. The full Supplement Facts help them see all seven label lines.
- 4
Tell the order desk
Call +1 (302) 200-3480 with your order ID to report it and ask about a refund.
Do not use any bottle with a damaged or missing safety seal. Our medical reviewer checks the safety wording on this page; see who reviews our safety pages. The research gaps are laid out on the ingredients page.
Horsewood side effects: common questions
Questions people type into Google and Bing, answered from the label and the sources on this page.
Does Horsewood have side effects?
It can, even though no one has tested the finished product. Its herbs have known risks: saw palmetto may add to bleeding risk, horny goat weed has case reports of fast heart rhythm, and tongkat ali has rare liver injury reports.
Can Horsewood cause headaches?
No headache data exists for Horsewood, because the product itself has never been studied. If a headache is severe or comes with blurred vision or chest pain, stop the capsules and get medical help.
Is tongkat ali bad for your liver?
Liver injury from tongkat ali is rare but reported, per NIH LiverTox. Long-term safety is not well known, and some tongkat ali products have been found with lead, mercury or hidden sildenafil.
What are the side effects of horny goat weed?
Case reports describe a fast heart rhythm and rash, mostly in older people with heart disease. Controlled human trials are lacking, so its safety is not well mapped.
Can saw palmetto cause bleeding?
It may. Saw palmetto may raise bruising and bleeding risk with blood thinners, and case reports describe heavy bleeding during surgery. Tell your surgeon you take it.
Does Horsewood interact with blood thinners?
It may. Horsewood contains saw palmetto, which may add to bleeding risk with blood thinners. Ask your doctor or pharmacist before you start.
Can I take Horsewood with Viagra or Cialis?
Do not combine them without your doctor. No one has studied the mix, horny goat weed may affect blood pressure, and FDA keeps finding hidden sildenafil and tadalafil in sexual-enhancement supplements.
Is Horsewood safe for your heart?
Nobody has tested it for heart safety. Horny goat weed has case reports of heart rhythm problems. If you have heart disease or take heart medicines, especially nitrates, get your doctor's clear yes first.
What should I do if I have a reaction to Horsewood?
Stop the capsules first. Call 911 for chest pain, fainting, trouble breathing or heavy bleeding. For milder problems, call your doctor and bring the bottle.
Can Horsewood cause liver problems?
Rarely, through its tongkat ali. Watch for yellow skin or eyes, dark urine, pale stools or pain in the upper right belly. Stop and call a doctor if you see any of them.
Is Horsewood safe if I have a medical condition?
The label says anyone with a known medical condition should consult a physician first. The same goes for anyone on prescription medicines or due for surgery.
