Safety, by ingredient
HorseFil Side Effects, Safety and Drug Interactions
HorseFil's six named ingredients are generally well tolerated in short studies, but amounts are not published. Watch for trouble sleeping, headache, dizziness and stomach upset. Ginseng may affect diabetes medicines, rhodiola losartan, L-carnitine seizure medicines, grape seed blood thinners, and citrulline blood pressure medicines and nitrates. Adults 18+ only. Ask your doctor first if you take medicine.
Is HorseFil safe to take?
HorseFil is a dietary supplement for healthy adult men, and most of its six named ingredients have a fair safety record in short studies. The catch is that the amount of each one is not published, so nobody can say exactly how much you get per gummy.
The brand's ingredients panel names L-citrulline, L-carnitine, Panax ginseng extract, maca root extract, rhodiola extract and grape seed extract. You can read more about each on the ingredients page. The Supplement Facts panel was not supplied to us, so the serving size and the gummy base are also unknown. That is why we list side effects by ingredient, using federal fact sheets.
Supplements are not approved by the FDA before they go on sale. The FDA's dietary supplement page explains that makers are responsible for safety and labels. Keep that in mind as you read.
Which medicines can interact with HorseFil?
Five of the six named ingredients have a known or possible medicine interaction. The biggest ones involve diabetes medicines, losartan, seizure medicines, blood thinners and blood pressure medicines, including nitrates.
| Ingredient | Medicine type | Why it matters | What to do |
|---|---|---|---|
| Panax ginseng | Diabetes medicines (insulin, pills that lower blood sugar) and some other medicines | NCCIH says ginseng may lower blood sugar. Added to a diabetes medicine, sugar could drop lower than planned. | Ask your doctor first. If you get the okay, check your sugar more often in the first weeks. |
| Rhodiola | Losartan (a blood pressure medicine) | NCCIH lists a reported interaction between rhodiola and losartan. | Do not add HorseFil on your own. Ask the doctor who prescribes your losartan. |
| L-carnitine | Valproic acid and some other seizure medicines; pivalate antibiotics | The NIH Office of Dietary Supplements lists these interactions with carnitine. | Talk to your neurologist or pharmacist before you start. Never change a seizure medicine yourself. |
| Grape seed extract | Blood thinners (for example warfarin) and anti-platelet medicines | Grape seed extract may add to the effect of blood thinners, which could raise bleeding risk. | Ask your doctor. Watch for easy bruising or unusual bleeding. |
| L-citrulline | Blood pressure medicines, including nitrates | Citrulline may add to medicines that lower blood pressure. Nitrates are a special concern. | Ask your doctor first. Stop and get help if you feel faint or dizzy when you stand. |
| Maca root | No specific interaction named in the sources we use | Maca is a food root. NIH LiverTox keeps a page on maca. | Still list HorseFil with your other supplements when you see a clinician. |
Effects may stack when ingredients mix. If you take more than one medicine, a pharmacist can check the full list quickly.
Sources: NCCIH on Asian ginseng, NCCIH on rhodiola, NIH ODS on carnitine and NCCIH on grape seed extract.
Who should not use HorseFil?
HorseFil is for healthy men 18 and older. Some people should skip it, or at least wait for a doctor's okay.
- Anyone under 18. HorseFil is not made for teens or children.
- Anyone who takes a diabetes medicine, losartan, a seizure medicine, a blood thinner or a nitrate, unless a doctor says yes.
- People with low blood pressure or who faint easily.
- Anyone with a surgery or dental work coming up. Ask when to pause, since grape seed and blood thinners share a concern.
- People with kidney, liver or heart disease, unless their specialist agrees.
- Anyone who has had a reaction to ginseng, grapes or any of the six named ingredients.
If you are not sure where you fit, read our who it is for page and then ask your doctor.
What side effects are reported for these ingredients?
The most common reported effects are mild: trouble sleeping, headache, dizziness, dry mouth and stomach upset. Most of these show up at doses much higher than a gummy is likely to hold, though we cannot confirm the doses in HorseFil.
| Ingredient | Side effects named by federal sources | Source |
|---|---|---|
| L-citrulline | Exercise studies used about 3 to 6 g a day. The review we cite focused on exercise results, not a side effect list. | Gonzalez & Trexler, 2020 |
| L-carnitine | At about 3 g a day: nausea, vomiting, stomach cramps, diarrhea and a fishy body odor. | NIH ODS |
| Panax ginseng | Trouble sleeping is the most common. Short-term use up to 6 months appears safe for most people. | NCCIH, Feb 2025 |
| Maca root | Eaten as food in Peru. Studies commonly used about 1.5 to 3 g of dried maca a day. | Gonzales, 2012, NIH LiverTox |
| Rhodiola | Dizziness, headache, trouble sleeping, dry mouth or extra saliva. Possibly safe for up to 12 weeks. | NCCIH, Apr 2025 |
| Grape seed extract | Generally well tolerated in studies. Talk to a provider before use. | NCCIH |
Research on these ingredients is not all strong. NCCIH says there is not enough reliable evidence that rhodiola helps any health purpose, and a 2011 systematic review found rhodiola trials of mixed quality. Grape seed blood pressure trials used anywhere from the low hundreds of milligrams up to 2,000 mg a day (Zhang et al., 2016).
Trouble sleeping
Ginseng and rhodiola both list it. Taking your serving earlier in the day may help. Stop if it keeps up.
Stomach upset
Nausea, cramps or loose stools are listed for carnitine at higher doses. A gummy taken with food may sit better.
Dizziness or headache
Rhodiola lists both. Citrulline may lower blood pressure. Sit down, drink water, and stop if it returns.
How do I lower the chance of side effects?
Start with the label and do not go past it. These steps cut most avoidable problems.
Read the jar label
Take HorseFil as directed on the jar label. The serving size is not published here, so the label is your guide.
Do not double up
Do not take more than the label says unless a clinician tells you to. More is not safer.
Check your medicine list
Match each medicine you take against the interaction table. Ask a pharmacist if anything lines up.
Try one new thing at a time
Avoid starting HorseFil in the same week as another new supplement. Then you know what caused any change.
Keep notes for two weeks
Write down sleep, stomach and energy each day. Notes help you and your doctor decide.
Our how to use guide walks through a simple daily routine.
When should I stop taking HorseFil?
Stop right away and call a doctor if you have signs of an allergic reaction, fainting, chest pain, a racing heartbeat, unusual bleeding or yellowing skin or eyes. For trouble breathing or chest pain, call 911.
- Stop and call 911 for swelling of the face or throat, trouble breathing or chest pain.
- Stop and call your doctor for fainting, a pounding heartbeat, unusual bruising or bleeding.
- Stop and call your doctor for dark urine, yellow skin or eyes, or pain on the right side of your belly.
- Stop and call your doctor if blood sugar readings drop lower than usual.
- Stop for sleep trouble, headache or stomach upset that lasts more than a few days.
Bring the jar with you to any visit. The label, the lot number on the base and your order date all help. You can also find the lot on our batch check page.
How do I report a side effect to the FDA?
You can report any problem with a supplement through FDA MedWatch, online or by phone. You do not need a doctor to file, and a report helps the FDA spot patterns.
Get care first
See a doctor or urgent care if the reaction is serious. Reporting can wait until you are safe.
Gather details
Have the jar, the lot number from the base, the date you started and the date the problem began.
File with MedWatch
Go to FDA MedWatch and pick the consumer form. Describe what happened in plain words.
Tell the order desk
Call +1 (302) 200-3480 with your order ID so the retailer knows about the lot. This is also how a refund starts.
HorseFil safety: common questions
Can I take HorseFil with blood pressure medicine?
Ask your doctor first. L-citrulline may add to blood pressure medicines, including nitrates, and rhodiola has a reported interaction with losartan.
Does HorseFil cause trouble sleeping?
It can for some people. Trouble sleeping is the most common side effect NCCIH lists for Asian ginseng, and rhodiola lists it too. Taking your serving earlier in the day may help.
Is HorseFil safe with a blood thinner?
Talk to your doctor before use. Grape seed extract may add to the effect of blood thinners, which could raise bleeding risk.
How long can I take HorseFil?
No long-term safety data exist for HorseFil itself. NCCIH says ginseng appears safe for up to 6 months and rhodiola possibly safe for up to 12 weeks. Review use with your doctor.
Who do I tell about a side effect?
Your doctor first. You can also report it to FDA MedWatch and call the order desk at +1 (302) 200-3480 with your order ID and lot number.
Sources for this page
- National Center for Complementary and Integrative Health. Asian Ginseng. Updated February 2025. Source
- National Center for Complementary and Integrative Health. Rhodiola. Updated April 2025. Source
- Hung SK, Perry R, Ernst E. The effectiveness and efficacy of Rhodiola rosea L.: a systematic review of randomized clinical trials. Phytomedicine, 2011. Source
- NIH Office of Dietary Supplements. Carnitine: Fact Sheet for Health Professionals. Updated 2023. Source
- National Center for Complementary and Integrative Health. Grape Seed Extract. Updated February 2025. Source
- Zhang H, et al. The impact of grape seed extract treatment on blood pressure changes: a meta-analysis of 16 randomized controlled trials. Medicine (Baltimore), 2016. Source
- Gonzalez AM, Trexler ET. Effects of citrulline supplementation on exercise performance in humans: a review of the current literature. J Strength Cond Res, 2020. Source
- Gonzales GF. Ethnobiology and ethnopharmacology of Lepidium meyenii (Maca), a plant from the Peruvian highlands. Evid Based Complement Alternat Med, 2012. Source
- NIH LiverTox. Maca. National Institute of Diabetes and Digestive and Kidney Diseases. Source
- U.S. Food and Drug Administration. Dietary Supplements. Source
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