Horseradish Glycemic Index
Low GI · The honest verdict
Gentle on blood sugar
Glycemic index
15
per source
Glycemic load
1
Low GL
This food's glycemic index is 15, which is Low GI.
Horseradish as used in cooking — a tablespoon or so — has virtually no blood sugar impact. Its carb content per condiment serving is under 2 grams, making its glycemic load essentially zero. This is general nutrition information, not medical advice — people with diabetes should confirm dietary choices with their care team.
GI numbers vary by source, ripeness, and how a food is prepared. This is general nutrition information — not medical advice. If you manage diabetes, confirm specifics with your care team.
Key facts
A tablespoon of prepared horseradish has only about 7 calories and 1.7 g total carbs — making it one of the lowest-impact condiments.
Horseradish belongs to the Brassicaceae (mustard) family — the same family as broccoli, wasabi, and Brussels sprouts.
Harvard T.H. Chan School of Public Health — The Nutrition Source
Vinegar in prepared horseradish may modestly lower the glycemic impact of foods eaten with it, due to acetic acid's effect on starch digestion.
What's actually inside
Per 100 g, with your typical serving noted as 1 tablespoon (15 g), prepared. The carb family is what moves blood sugar — fiber is the number that softens the spike.
Total carbs
1.7g
Net carbs
1.1g
total carbs minus fiber
Fiber
0.5g
slows the glucose rise
- Sugars
- 0.6g
- Protein
- 0.2g
- Calories
- 7kcal
Notable nutrients
- Vitamin C3.2 mg
- Folate4 mcg
- Potassium44 mg
- Calcium9 mg
- Glucosinolatespresent (pungency compound)
Is it a smart choice for blood sugar?
GI is only half the story — portion (glycemic load) and what you eat it with decide the real-world effect. Here's the honest read.
The verdict
Blood-sugar neutral in condiment amounts
Horseradish as used in cooking — a tablespoon or so — has virtually no blood sugar impact. Its carb content per condiment serving is under 2 grams, making its glycemic load essentially zero. This is general nutrition information, not medical advice — people with diabetes should confirm dietary choices with their care team.
Portion guidance
In condiment-sized servings (1–2 tablespoons), horseradish contributes negligible carbs and has no meaningful impact on blood sugar. Even in larger culinary uses — such as mixing horseradish into a sauce or spread — the amounts used remain small enough to be inconsequential. Prepared horseradish products with added sugar may have slightly higher carb counts; check labels if relevant.
This is general nutrition information, not personal medical advice. Blood sugar responses are individual — if you have diabetes or prediabetes, your care team can tell you how this fits your plan.
How to keep the spike small
The same food can land differently depending on how it's cooked and what it's eaten with. Use these levers to your advantage.
Freshly grated raw horseradish
Little effectFresh horseradish root grated at serving has the lowest carb contribution and maximum pungency from volatile glucosinolates, with negligible blood sugar impact.
Prepared (jarred) horseradish in vinegar
Little effectVinegar-preserved prepared horseradish maintains a low-carb profile. Vinegar itself may slightly lower the GI of foods eaten alongside it — a modest but real pairing benefit.
Creamy horseradish sauce with added sugar
Raises GICommercial horseradish cream sauces sometimes contain added sugars and cream. The horseradish itself contributes minimal carbs; any glycemic impact comes from added ingredients — check the label.
Cooking horseradish into sauces
Little effectHeat diminishes the volatile pungency of horseradish but does not meaningfully change its glycemic profile. Cooked horseradish sauce remains low in carbs from the horseradish component.
Pairing tip
Horseradish is a natural low-carb condiment for roast beef, smoked salmon, and eggs — all protein-rich, blood-sugar-friendly foods. Its pungency adds intensity without adding carbs or calories. Mixing prepared horseradish into Greek yogurt creates a quick, protein-rich dip that is excellent for blood sugar management.
Why GI numbers vary
Formal GI testing of horseradish as a standalone food is extremely limited in the published literature — it is consumed in such small quantities that formal testing is rarely conducted. The estimated GI of approximately 15 reflects its composition: low digestible carbohydrate content with some fiber, typical of pungent root condiment vegetables. In any realistic culinary serving, the glycemic load is so close to zero that the exact GI is practically irrelevant.
Not medical advice. This page is general nutrition information about Horseradish. It isn't a diagnosis or a treatment plan. If you have diabetes, prediabetes, or another condition affecting blood sugar, confirm any dietary decisions with your doctor or care team.
❓Frequently Asked Questions
Horseradish has an estimated GI of approximately 15 — low-GI by all standard thresholds. Formal GI studies of horseradish specifically are very limited because it is used in such small condiment-sized portions that testing is rarely prioritized. In a typical tablespoon serving, the glycemic load is essentially zero — fewer than 2 grams of total carbs with about 0.5 g fiber.
Yes, freely in condiment amounts. Horseradish in typical servings contributes negligible carbohydrates and has essentially no glycemic impact. It adds flavor intensity without blood sugar consequences. People should check labels on commercial prepared horseradish products, as some brands add sugar to jarred versions. As always, people with diabetes should consult their care team for personal dietary guidance — this is general nutrition information.
Horseradish is one of the most keto-friendly condiments available. A tablespoon has approximately 1.1 g of net carbs — essentially negligible. Even two or three tablespoons contribute fewer than 4 grams of net carbs, leaving ample room in a strict keto budget. Plain prepared horseradish (vinegar and horseradish only) is safer for keto than sweetened commercial sauces.
Horseradish contains glucosinolates — the sulfur compounds responsible for its pungency — which are also found in other cruciferous vegetables like broccoli and wasabi. Some research suggests glucosinolates may have antioxidant properties, but the evidence at typical dietary amounts is preliminary. Horseradish is also a source of vitamin C and folate in larger raw root portions. These are nutrition observations, not medical claims.
Some commercial prepared horseradish products do add small amounts of sugar to balance the heat. Plain prepared horseradish (just grated horseradish, vinegar, and salt) contains virtually no added sugar. Horseradish cream sauces and cocktail sauce variations can contain more. Checking the ingredient list and nutrition label is the most reliable approach if minimizing added sugar is a priority.
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Reviewed by
Curex Editorial TeamReviewed for accuracy
Last reviewed July 2026