Women health

 Symptoms of garlic poisoning in humans

Garlic is one of the many foods that, when consumed in excess, can be hazardous and harmful to your health.

Garlic is tasty and has a strong, pungent taste. This herb has therapeutic qualities. However, have you ever considered the negative consequences of garlic?

This article examines the 14 negative effects of garlic and suggests precautions to take before taking it. Let's begin.


1. May result in liver damage

The liver may be harmed by consuming too much garlic. Although raw garlic has antioxidant potential, too much of it can poison the liver (1). According to research done on rats, taking garlic at high dosages (0.5 grams per kg of body weight) can cause liver damage. Garlic is healthy for the liver in little dosages, though (0.1 to 0.25 grams per kg of body weight daily).

2. Potentially Harmful Odor

Two of the most frequent side effects of garlic, according to an Italian investigation, were body odor and garlic breath (3). Body odor can also occur from consuming garlic, so it's not just a problem of poor personal cleanliness.

It has been observed that garlic breath persists in the mouth for some time after brushing. According to some professionals, the same compounds that make garlic beneficial and what cause it to cause foul breath are the same chemicals (5). It might be embarrassing, nevertheless, to have foul breath. So, before taking garlic, you should probably think again. Use a mouth-refreshing spray as an additional precaution.

According to anecdotal data, eating raw garlic bulbs on an empty stomach may result in nausea, vomiting, and heartburn. Garlic consumption has been linked to heartburn and nausea in certain observational studies (6). In certain people, excessive garlic consumption might lead to GERD (gastroesophageal reflux disease). To fully comprehend this negative effect of garlic, more study is required.

4. Might Lead to Diarrhea

Overeating fresh garlic might make you sick. Garlic might result in flatulence and diarrhea

5. Might Lead to Gastric Problems

A polymer barrier is applied to enteric-coated garlic products in one Japanese study to prevent disintegration in the stomach environment. After consuming these garlic items, the mucous membrane of the stomach became red (8). The findings imply that garlic use and related items should be avoided since they may negatively impact stomach health.

Contrary to widespread perception, there is no proof that eating garlic reduces the risk of stomach cancer.

Garlic might reduce blood pressure (10). However, it could cause hypotension if you are currently taking drugs for high blood pressure (low blood pressure). It has also been demonstrated that taking extra garlic lowers blood pressure (11). Therefore, taking garlic supplements while also taking blood pressure medicine may not be a good choice. Garlic taken orally can also slightly lower blood pressure.

7. Can Worsen Bleeding

The risk of bleeding may rise after using garlic. Warfarin and other blood thinners should not be taken together as a result.

Particularly in the case of fresh garlic, this is true. It is also preferable to cease consuming garlic at least seven days before to scheduled surgery. Garlic contains antiplatelet properties and could make operation bleeding more pronounced.

8. Might Cause Sweating

Garlic may, according to certain research, make some people sweat excessively (15). More research is needed in this area, though.

9. Might Make You Feel Dizzy and nauseous

Garlic consumption in excess can make you feel lightheaded (16). This action's mechanism is still being investigated.

10. May Lead To Eczema or Rash

Garlic can irritate the skin when in contact with it for an extended period of time. This discomfort may be caused by some particular enzymes in garlic. According to anecdotal evidence, eczema may also be a disorder that comes along with this allergy.

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Given that they all come from the same botanical family and contain similar proteins, foods like onions, shallots, chives, and leeks may cause an allergic reaction if you are allergic to garlic.

According to one study, using garlic for cooking on a regular basis may cause skin rashes.

11. Potential for Drug Interaction

One investigation discovered interactions between warfarin, fluindione, ritonavir, and chlorpropamide as well as garlic and these drugs.

12. Might Lead to Headache

Garlic, especially when consumed raw, may cause migraines (19). It doesn't immediately create a migraine headache, but it does start the process that does.

Though the precise cause of this is unknown, some specialists think it might have something to do with the trigeminal nerve, the primary pain pathway in the body. Garlic consumption may trigger this nerve to release neuropeptides, which rush to the membrane encasing your brain and create headaches.

13. May Make Yeast Infection (Vaginal) Worse

Cloves of garlic may aggravate the vagina's delicate tissue (20). To treat vaginal yeast infections, some women place garlic cloves in the vagina. It is not advised to do this.

14. May Affect Vision

A disease known as hyphema, or bleeding inside the eye chamber (the space between the iris and the cornea), has been reported to be caused by consuming too much garlic (16). Garlic is an anticoagulant that can worsen or cause hyphema when taken in high dosages. Additionally, hyphema may result in irreversible eyesight loss.

Other negative effects of garlic may also exist, according to anecdotal evidence. Appetite loss could result from excessive ingestion. Kidney hematomas (swelling of clotted blood within kidney tissues), chemical burns in the mouth, and potentially fatal allergic responses can result from too much garlic.

A disorder known as pemphigus, an autoimmune disease, may also be brought on by garlic.

A list of items is available that, when combined with garlic, may have negative consequences. These have been covered in the section that follows.

What Are the Things to Avoid When Taking Garlic?

It is advised to stay away from eating specific meals that include garlic to prevent the negative effects. These consist of:

  1. Clove
  2. Ginger
  3. Ginkgo
  4. Animal chestnut
  5. Clover, red
  6. Turmeric
  7. Willow
  8. Capsicum
  9. Poplar
  10. Danshen

Too much garlic consumption might have negative effects. How much garlic, though, is too much?


The clinical dietitian at Memorial Regional Hospital South, Jesse Feder, asserts that garlic is not poisonous. Nonetheless, consuming no more than 1-2 raw garlic cloves is generally advised each day.


Garlic side effects are mostly linked to long-term overconsumption. Excessive amounts of garlic may cause liver damage, as well as nausea, vomiting, heartburn, foul breath, gastrointestinal problems, perspiration, dizziness, migraines, visual disturbances, and yeast infections. Moreover, it could reduce blood pressure and interact with some medicines. To avoid unfavorable side effects, you must also avoid combining garlic with clove, chestnut, ginger, and ginkgo. Yet, consuming garlic in moderation has significant advantages.

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