Eating excess garlic may lead to skin irritation and rashes. Garlic contains an enzyme called alliinase, which is usually the cause of skin rashes. It is quite often advised to wear hand gloves while cutting garlic, as the same enzyme present in it can cause rashes and itchiness.
Garlic if taken in its raw form may trigger headaches as well. It doesn’t cause a headache on the spot but can trigger the process. As per various studies, consuming raw garlic might stimulate the trigeminal nerve to release neuropeptides that go to the membrane covering the brain and triggers a headache.
According to various observational studies, consuming raw garlic bulbs in excess amounts may lead to vomiting and even heartburn. So to avoid this, you can always limit the intake of garlic.