Safety
GlycoBarrier side effects and interactions
Six ingredients means six safety files, and this formula carries more specific warnings than anything else this desk has covered. This page goes through them one at a time, quoting the source rather than summarising it.
The label’s caution reads: “Do not exceed recommended dose. Check with your doctor before using this product if you are using medication or have any medical condition.” The four interactions worth naming are butcher’s broom with diabetes, hawthorn, horse chestnut and grape seed with blood thinners, hawthorn in pregnancy, and horse chestnut’s unprocessed seed toxicity.
The label's own caution
“Do not exceed recommended dose. Check with your doctor before using this product if you are using medication or have any medical condition.”
Plus the standard lines:
- KEEP OUT OF REACH OF CHILDREN.
- DO NOT USE IF SAFETY SEAL IS DAMAGED OR MISSING.
- STORE IN A COOL, DRY PLACE.
And the FDA statement: “These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.”
Note what is not on the bottle: not one of the four named interactions below appears anywhere on this label or on any marketing panel supplied with it. “Check with your doctor… if you are using medication or have any medical condition” is doing all of the work, and it is doing it without telling the reader which medication or which condition.
Ingredient by ingredient
| Ingredient | What the cited source reports |
|---|---|
| Gotu Kola Extract | MSK lists skin rash and liver toxicity among reported adverse effects, and warns that lab studies suggest gotu kola may increase the risk of side effects of CYP450 substrate drugs, with the clinical relevance not yet determined. |
| Chinese Hawthorn Extract | MSK says not to take hawthorn if you are pregnant or taking antiplatelets or anticoagulants, and lists dizziness as the most common side effect, with low blood pressure and irregular heartbeat on overdose. NCCIH separately warns that some products sold as hawthorn have been found to contain toxic yellow oleander, which "may cause severe harm or even be fatal", and that no study has tested whether hawthorn is safe beyond 16 weeks. |
| Horse Chestnut Extract | MSK states that "horse chestnut seeds are toxic, and can cause major stomach irritation, vomiting, muscle twitching, incoordination, redness, facial swelling, and other serious conditions" — properly processed extracts remove the toxic component, and no processing information is published for this product. It also documents a life-threatening kidney rupture, heart inflammation in a 32-year-old man, and several intestinal obstructions requiring surgery, and warns that horse chestnut products containing aesculin may increase bleeding risk with warfarin, aspirin or other blood thinners. |
| Motherwort Extract | No citable safety file means no quantified safety information, which is not the same as an absence of risk. Motherwort is traditionally avoided in pregnancy and is generally described as having sedative and cardiac activity, so it belongs in the conversation with a clinician alongside anything you take for your heart. |
| Butcher's Broom Extract | MSK carries an explicit Do Not Take line: "You have diabetes (butcher's broom was reported to cause diabetic ketoacidosis, characterized by high levels of compounds called ketones in the blood.)" The case it cites is a 39-year-old woman with diabetes, five days after taking butcher's broom for mild ankle swelling. Diarrhoea and skin reactions are also reported. |
| Grape Seed Extract | MSK advises talking to a healthcare provider if you take blood thinners such as warfarin, because "grape seed extract may increase your risk of bleeding", and notes in vitro antiplatelet activity plus inhibition of CYP3A4 and modulation of UGT enzymes. NCCIH describes it as generally well tolerated. |
One ingredient above — motherwort — carries no citation on this site, because we could not find a monograph at NIH, NCCIH or MSK to link. Its row reflects that honestly: absence of a reported harm in a source that does not exist is not evidence of safety.
Interactions that have names
Butcher's broom × diabetes
MSK's monograph carries an explicit Do Not Take line: “You have diabetes (butcher's broom was reported to cause diabetic ketoacidosis, characterized by high levels of compounds called ketones in the blood.)” The case cited is a 39-year-old woman with diabetes, five days after taking butcher's broom for mild ankle swelling. Diabetic ketoacidosis is a medical emergency. This is the most serious single line on this site, and it sits inside a product whose name evokes blood sugar.
Three ingredients × blood thinners
MSK says do not take hawthorn if you are taking antiplatelets or anticoagulants, citing a lab study suggesting increased side effects. It warns that horse chestnut products containing aesculin may increase bleeding risk with warfarin, aspirin or other blood thinners. And it advises talking to a provider about grape seed because it “may increase your risk of bleeding”. Three flags in one 121 mg blend.
Hawthorn × pregnancy and digoxin
MSK's hawthorn monograph lists pregnancy under Do Not Take. It also flags potential interference with digoxin, noting that one small trial showed safe coadministration. Separately, NCCIH warns that some products sold as hawthorn have been found to contain toxic yellow oleander, which “may cause severe harm or even be fatal”, and that no study has tested hawthorn beyond 16 weeks.
Horse chestnut × processing
MSK states that “horse chestnut seeds are toxic, and can cause major stomach irritation, vomiting, muscle twitching, incoordination, redness, facial swelling, and other serious conditions”. Commercial extracts are processed to remove the toxic esculin fraction. No processing, standardisation or aescin figure is published for this product, so a buyer cannot confirm that step was taken. MSK also documents a kidney rupture, heart inflammation and several intestinal obstructions requiring surgery.
The exposure cannot be quantified
Every warning on this page describes an ingredient. None of them can be scaled to this product, because no amount is published for any ingredient in the blend. A cautious reading is to treat each warning as applying, rather than to assume 121 mg split six ways is too small to matter — you have no way to know that it is, and neither do we.
What to do if something happens
Stop taking it
First and simplest. There is no taper and no withdrawal concern documented for any ingredient here.
Keep the bottle
The lot number, the panel and the other-ingredients line are all on it, and a clinician or a pharmacist will want to read them rather than hear them described.
Get medical help for anything serious
Unusual bleeding or bruising, severe stomach pain, vomiting, muscle twitching, facial or throat swelling, chest pain, palpitations, fainting or flank pain are emergency-room symptoms, not wait-and-see ones. If you have diabetes and feel unusually thirsty, breathless or confused, treat it as urgent.
Tell the seller
The order desk is +1 (302) 200-3480. A seller who hears about a reaction can pass it up the chain; one who never hears about it cannot.
Report it to the FDA
Anyone can report a supplement problem through the FDA's MedWatch programme. Adverse event reporting for supplements is voluntary and thin, which is exactly why individual reports matter.
And the general caveat that applies to everything on this page: this site is a stocking partner's information desk, not a clinic. Nothing here is medical advice, nothing here replaces a conversation with someone who knows your history, and nothing here is a reason to change a prescribed medicine.
- Memorial Sloan Kettering Cancer Center, About Herbs (2026). Hawthorn.
- Memorial Sloan Kettering Cancer Center, About Herbs (2026). Horse Chestnut.
- Memorial Sloan Kettering Cancer Center, About Herbs (2026). Butcher's Broom.
- Memorial Sloan Kettering Cancer Center, About Herbs (2026). Grape Seed.
- Memorial Sloan Kettering Cancer Center, About Herbs (2026). Gotu Kola.
- NCCIH, National Institutes of Health (2026). Hawthorn: Usefulness and Safety.
- NCCIH, National Institutes of Health (2026). Grape Seed Extract: Usefulness and Safety.
How supplement side effects get missed
Adverse event data for supplements is thin, and the reasons are structural rather than sinister. Knowing them changes how you read a sentence like “generally well tolerated”.
- Reporting is voluntary. Serious events are meant to be reported by manufacturers, but there is no systematic collection comparable to prescription medicines.
- People do not connect the two. Unusual bruising three weeks into a botanical blend gets blamed on a knock far more often than on the drops.
- Multi-ingredient products hide causes. When six extracts share a bottle, no individual one can be implicated with confidence — which is the same reason the case reports MSK cites are usually described as unproven.
- Nobody knows the exposure. With no published amounts, even a clinician investigating a reaction cannot say how much of anything you took.
- Mild effects go unrecorded entirely. Most of what people experience with botanicals is mild and transient, and almost none of it reaches any database.
So when a source says an ingredient is generally well tolerated and reports few concerns, read that as two separate statements rather than one reassuring one. Absence of reported harm is not evidence of safety, and the sources cited on this site are careful to say so themselves.
What to tell a clinician, in one sentence
If you are going to mention this to a doctor or pharmacist — and if you have diabetes or take a blood thinner, you should — here is the sentence that gets you the most useful answer in the least time.
“I want to take a liquid supplement containing gotu kola, hawthorn, horse chestnut, motherwort, butcher’s broom and grape seed. It is a 121 mg proprietary blend, the individual amounts are not published, and I take 2 ml a day. Here is the bottle.”
That sentence contains the four things they need: the ingredients, the fact that it is a blend, the daily volume, and the bottle itself. It also pre-empts the question they would otherwise ask, which is how much of each you would be taking — and the answer, which is that nobody knows.
Take the physical bottle if you can. Six ingredient names read from a panel in ten seconds; six ingredient names recited from memory take five minutes and usually lose one — and on this product the two most likely to be forgotten are the two that matter most.
Read the panel first, then decide
A 60 ml dropper bottle, 30 servings, one 121 mg blend of six botanicals and no individual amounts. The live price and the return terms are both shown on the seller’s checkout screen.
Listing return terms · Questions first? Call +1 (302) 200-3480