Is Garlic Low FODMAP? (And What to Use Instead)

Fresh garlic is high FODMAP and has to come out during the elimination phase. Since garlic anchors most savory Western cooking (soups, stir-fries, pasta sauces, salad dressings, marinades), the practical question is how to keep the flavor without the fructans.

The answer is garlic-infused oil, a workaround validated by Monash University (the research team that built the low-FODMAP diet). This post covers why garlic is high FODMAP, what that means in practice, and which substitutes work.

The short answer

Fresh garlic is high FODMAP. Even a single clove isn't elimination-phase compliant.

Garlic-infused oil is low FODMAP and safe on the diet. It's the workaround most low-FODMAP cooks rely on.

Why garlic is high FODMAP

Garlic is one of the most fructan-dense foods in the common Western diet. Fructans are a type of FODMAP the small intestine can't break down. Instead of being digested, they pass into the large intestine, where gut bacteria ferment them. That fermentation produces gas and pulls water into the gut, which is what triggers bloating, cramping, and altered bowel habits in people with IBS.

Monash lists fresh garlic as high FODMAP even at very small serves. It's generally avoided entirely during the elimination phase.

Substitutes that don't work (but people try)

A few swaps come up again and again. Most of them don't solve the problem.

Garlic powder and garlic salt are still high in fructans. Dehydration removes water, not fructans, so a teaspoon of garlic powder is concentrated garlic. It's worse than a clove, not better.

Roasted garlic doesn't help either. Cooking doesn't break down fructans. A whole roasted head has the same FODMAP load as the raw cloves, just softer and sweeter.

Cutting a recipe's garlic in half isn't enough of a reduction. Garlic's fructan density is high enough that even a quarter clove is still high FODMAP. "A little" isn't elimination-phase compliant.

Fermented garlic (including black garlic) is sometimes claimed to have reduced FODMAPs from fermentation, but this hasn't been confirmed by Monash testing and most people still react to it. Skip it for now.

Why garlic-infused oil works

Fructans are water-soluble, not fat-soluble. When garlic steeps in oil, the flavor compounds dissolve into the oil, but the fructans stay locked in the cloves. The oil picks up the full garlic flavor without carrying the FODMAP load.

You pour off the oil, discard the cloves, and cook with the flavored oil as if it were regular garlic. Monash has confirmed that garlic-infused oils are low FODMAP as long as they contain no garlic solids, and certifies specific brands that meet that standard. Any solid garlic pieces floating in the oil would still carry fructans, so they have to be strained out.

Two ways to get it:

1. Buy it. Look for brands with the Monash FODMAP certified logo. Cobram Estate's garlic-infused extra virgin olive oil is one widely available certified option in the US.
2. Make it at home. Warm olive oil with crushed cloves over low heat for about 15 minutes, strain through cheesecloth, and discard every bit of solid garlic. Refrigerate and use within a week. Food safety note: garlic in oil can grow botulism bacteria if stored at room temperature, so refrigeration isn't optional.

Use infused oil anywhere a recipe starts by sautéing garlic: the base of a stir-fry, the drizzle on pasta, a salad dressing, the pan for eggs.

Other substitutes worth knowing

Garlic-infused oil is the main move, but a few other ingredients fill in flavors that oil alone can't cover.

Green scallion tops (the green part of a green onion). Only the green tops are low FODMAP. The white bulbs are high-fructan like onions. Green tops give a mild oniony bite in everything from stir-fries to garnishes. Slice thin and add near the end of cooking.

Chives. Low FODMAP at standard serving sizes. Good for garnish, omelets, baked potatoes, and dips.

Garlic chives (Chinese chives). A different plant from regular chives, with a more garlicky flavor. Low FODMAP in standard cooking serves.

Asafoetida (hing). A sulfurous resin used in Indian cooking that tastes remarkably close to cooked garlic and onion when it hits hot oil. A pinch goes a long way. Buy pure asafoetida, not a blend. Some commercial hing is cut with wheat flour, which adds fructans back in.

Leek greens. Only the dark green tops, not the white or pale-green bulb. Same rule as scallions.

None of these alone fully replaces garlic. The combination most home cooks land on is garlic-infused oil as the base, plus scallion greens or chives layered on top.

FODMAP stacking: watch the total

FODMAPs from different foods add up. If dinner includes garlic-infused oil (fine on its own), plus a generous helping of avocado, plus a big scoop of chickpeas, the meal can still land over the threshold even though each of those foods has a low-FODMAP serving size on its own. The serving size is what decides whether something is low FODMAP, and portions stack across a meal.

This is called FODMAP stacking, and it's one of the most common reasons people say the diet "stopped working." Tracking what you eat and how you feel makes the pattern visible fast. The FODMAP Tracker app logs meals alongside symptoms and flags when fructan sources are stacking across the same plate.

What this looks like in practice

A weeknight dinner pattern that works well: olive oil into the pan, a splash of garlic-infused oil added right before the aromatics so the flavor doesn't cook off, the green tops of a scallion or two, protein, some low-FODMAP vegetables, salt, pepper. It tastes close to the Italian-leaning cooking most people grew up on, and the absence of real garlic usually isn't noticeable.

Infused oil plus scallion greens closes most of the gap between regular cooking and low-FODMAP cooking.

For meal ideas that use this substitution pattern, see our low-FODMAP recipes.

When can you eat real garlic again?

The elimination phase is typically 2 to 6 weeks long, not permanent. After that comes the reintroduction phase, where each FODMAP group gets tested individually. Fructans, the group garlic belongs to, is one of the standard reintroduction challenges.

A lot of people find they tolerate some amount of garlic during reintroduction, though it varies by person and by quantity. The elimination phase only runs a few weeks; reintroduction is where the long-term answer comes from.

Track your symptoms and discover patterns with FODMAP Tracker. Includes a database of 1,000+ foods with FODMAP ratings.