It is formed by the action of the enzyme alliinase on the compound alliin. (mindbodygreen.com)
Each time that this conversion process occurs (with the help of the enzyme called alliinase), there is a potential for two molecules of pyruvate to be formed. (whfoods.com)
When the garlic clove is crushed or chopped, it releases an enzyme known as alliinase. (verywellhealth.com)