These substances have been investigated for possible antioxidant, antimicrobial, anti-inflammatory, and cardiovascular effects.

Some laboratory research has also examined whether garlic-derived compounds can affect cancer-related processes. Researchers have observed effects involving cellular signaling, oxidative stress, programmed cell death, and other mechanisms in experimental models.

That sounds promising, but there is a major catch.

Laboratory findings do not automatically translate into a cancer treatment.

A compound may affect cancer cells in a test tube at a concentration that is difficult or impossible to achieve safely through ordinary food consumption. Human bodies are much more complicated than laboratory dishes.

Research in humans has produced mixed findings. Some observational studies have associated higher consumption of allium vegetables, including garlic, with lower risks of certain diseases. But observational studies cannot prove that garlic itself caused the difference.

People who eat more garlic may also eat more vegetables overall, exercise more, smoke less, drink less alcohol, or follow other healthier habits.

This is why researchers look at many types of evidence rather than relying on a single dramatic story.

Garlic can absolutely be part of a nutritious diet. It may contribute useful plant compounds while also adding flavor without requiring large amounts of salt or saturated fat.

But describing it as a cancer cure goes far beyond what the evidence currently supports.

Chapter 3: Eating Too Much Raw Garlic Can Have Downsides

Because garlic is a food, many people assume that consuming more must automatically be better.

That is not necessarily true.

Raw garlic can cause unpleasant gastrointestinal symptoms, particularly when eaten in large quantities. Some people experience heartburn, abdominal discomfort, nausea, bloating, or diarrhea.

The strong compounds in raw garlic can also irritate the digestive tract in sensitive individuals.