Garlic (Fresh)

Food · Vegetable · Food, Typed Supps

The compound behind its reputation only forms once you crush or chop it.

Stage by stage

Intake (Crushing activates an enzyme): Crushing or chopping activates an enzyme that converts a stable precursor into allicin — whole, uncut cloves don’t have this active compound.
Stomach (Allicin is unstable): Allicin begins breaking down quickly once formed, which is part of why fresh preparation timing matters.
Small intestine (Sulfur compounds absorbed): Various sulfur compounds derived from allicin are absorbed here.
Blood vessels (Mild blood pressure & lipid effects): Circulates with modest studied effects on blood pressure and cholesterol.

Timing

Crush or chop and let sit ~10 minutes before cooking to preserve allicin formation.

Time to effect

Weeks: Regular intake is linked to modest blood pressure and lipid effects in studies.

Allergens

None of the fourteen major allergens. Derived from what this food is, not from a product label.

Eating patterns

Fits: Vegan, Vegetarian, Pescatarian, Halal, Kosher, Gluten-free.

In season

July to November in the northern hemisphere, January to May in the southern.

Satiety

269 on the satiety index, where white bread is 100 — very high. Modelled from the Holt et al. (1995) measurements.

Environmental footprint

0.5 kg CO2e and 14 litres of freshwater per kg, matched to "Onions & leeks" in Poore & Nemecek (2018), Science 360.

Cost band

Cheap — roughly £2.5 per kg, as a band midpoint rather than a price.

Key nutrients

Allicin (when crushed)
Manganese
Vitamin B6

Nutrition per 100g

Calories: 124.8
Protein: 6.1g
Carbohydrate: 10.2g
of which sugars: 1.5g
Fat: 2.8g
of which saturated: 0.8g
Fibre: 16.9g
Sodium: 8mg

Food vs. supplement

Fresh garlic must be crushed or chopped and left to sit for about 10 minutes before cooking to preserve allicin formation — supplement extracts standardize this compound, which raw garlic preparation often doesn’t account for.

Kitchen tip

Letting chopped garlic sit for about 10 minutes before cooking gives the allicin-forming reaction time to happen before heat deactivates the enzyme.

Common myth

“Cooking garlic immediately after crushing doesn’t change anything.” In reality: Heat can destroy the enzyme needed to form allicin — letting crushed garlic rest for several minutes before cooking preserves more of the compound.