Ayurvedic medicine, the oldest form of medicine, does not recommend garlic at all. And they had very good reasons for this since it is known to be one of the most toxic herbs or plants, not fit for human consumption. This is because of its known destructive effects. Garlic works on bacteria-killing germs; therefore, it is an anti-bacterial food that can completely eradicate bacteria. Not many people think that that is a good thing. We want something that kills off germs, but it can have negative side effects that may be even worse than having a bacterial infection.
I personally do not recommend garlic for a number of reasons. There are some studies that show that garlic can actually cause damage to brain cells. It has that very powerful effect because garlic does end up in the blood stream if eaten in raw form; if eaten in cooked form, the negative or toxic effect is greatly diminished. So if a person does feel like they want the garlic, then they can take it in cooked form, and it will be less negative, or less harmful to the body.
Garlic burns; it literally can burn little holes through the lining of the intestines. Also, it can certainly penetrate the mucus lining and make its way through into the intestinal wall, where it can burn little holes that eventually can lead to perforations, if you eat it too often. And that is the part where they already have been eaten or damaged. So particularly people who have leaky gut, where the toxins already escape from the intestines and move into the blood stream, should be extra careful. This is because garlic should not really be in the blood.
Some people who have been through World War II or post-World War II, for example 5-10 years afterward, including several of Italian descent, were very knowledgeable about the toxic effects of garlic. Firsthand accounts indicate that some took garlic cloves with them to the front lines of battle, and squashed the garlic, basically using the juice from the garlic. They poured the garlic juice over their bullets and then put the garlic-laden bullets into their guns. According to anecdotal reports, the Italians were never known to be the best marksmen or shooters. To the contrary, they were famous for not being able to aim properly at enemy solders, so they often missed. It is quite possible that they missed more often than they succeeded. So they thought that putting garlic on the bullets might give them an advantage. By somehow shooting and hitting the enemy, just injuring them in the foot or somewhere else, not necessarily in the (life-threatening) heart or the head, the enemy would die when the garlic entered the enemy’s blood stream. They knew this because once garlic is in the blood, for instance by injecting raw garlic juice into the blood, you can certainly die from that.http://www.ener-chi.com/eating-garlic-is-very-toxic-for-the-body/