Humans may love garlic, but it's extremely unsafe for cats.
Garlic contains compounds called thiosulphates, which are toxic to felines. These chemicals can cause oxidative damage to red blood cells, leading to a condition called hemolytic anemia. This condition occurs when the body's immune system attacks its own red blood cells, leading to fatigue, lethargy, or even death. (The same type of toxicity can be caused by other members of the allium family of plants, which also includes onions, shallots, leeks, and chives.)
Even small amounts of garlic consumption can weaken your cat’s immune system over time, making them more susceptible to infections or diseases. Your cat's gastrointestinal tract could also become irritated and inflamed, leading to symptoms like diarrhea and vomiting.
If you suspect your cat has eaten any amount of garlic, contact your veterinarian immediately. They may recommend inducing vomiting or providing supportive care such as intravenous fluids and medications to help protect your cat's organs from potential harm. Fast treatment may save their life.
If your cat requires veterinary care due to eating garlic (or any other unsafe food), pet insurance can help cover the cost of treatment.