10 helpful and proven benefits of Garlic

Let food be thy medicine, and medicine be thy food."
Those are famous words from the ancient Greek physician Hippocrates, often called the father of Western medicine.
He actually used to prescribe garlic to treat a variety of medical conditions.
Modern science has recently confirmed many of these beneficial health effects.
Here are 11 health benefits of garlic that are supported by human research.

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Garlic is a plant in the Allium (onion) family.
It is closely related to onions, shallots and leeks. Each segment of a garlic bulb is called a clove. There are about 10–20 cloves in a single bulb, give or take.
Garlic grows in many parts of the world and is a popular ingredient in cooking due to its strong smell and delicious taste.
However, throughout ancient history, the main use of garlic was for its health and medicinal properties (1Trusted Source).
Its use was well documented by many major civilizations, including the Egyptians, Babylonians, Greeks, Romans and Chinese (2Trusted Source).
Scientists now know that most of its health benefits are caused by sulfur compounds formed when a garlic clove is chopped, crushed or chewed.
Perhaps the most famous of those is known as allicin. However, allicin is an unstable compound that is only briefly present in fresh garlic after it’s been cut or crushed (3Trusted Source).
Other compounds that may play a role in garlic’s health benefits include diallyl disulfide and s-allyl cysteine (4Trusted Source).
The sulfur compounds from garlic enter the body from the digestive tract and travel all over the body, where it exerts its potent biological effects.
SUMMARYGarlic is a plant in the onion family that’s grown for its distinctive taste and health benefits. It contains sulfur compounds, which are believed to bring some of the health benefits.

Calorie for calorie, garlic is incredibly nutritious.
A 1-ounce (28-gram) serving of garlic contains (5):
  • Manganese: 23% of the RDA
  • Vitamin B6: 17% of the RDA
  • Vitamin C: 15% of the RDA
  • Selenium: 6% of the RDA
  • Fiber: 0.6 grams
  • Decent amounts of calcium, copper, potassium, phosphorus, iron and vitamin B1
Garlic also contains trace amounts of various other nutrients. In fact, it contains a little bit of almost everything you need.
This comes with 42 calories, 1.8 grams of protein and 9 grams of carbs.
SUMMARYGarlic is low in calories and rich in vitamin C, vitamin B6 and manganese. It also contains trace amounts of various other nutrients.

Garlic supplements are known to boost the function of the immune system.
One large, 12-week study found that a daily garlic supplement reduced the number of colds by 63% compared to a placebo (6Trusted Source).
The average length of cold symptoms was also reduced by 70%, from 5 days in the placebo group to just 1.5 days in the garlic group.
Another study found that a high dose of aged garlic extract (2.56 grams per day) reduced the number of days sick with cold or flu by 61% (7Trusted Source).
However, one review concluded that the evidence is insufficient and more research is needed (8Trusted Source).
Despite the lack of strong evidence, adding garlic to your diet may be worth trying if you often get colds.
SUMMARYGarlic supplements help prevent and reduce the severity of common illnesses like the flu and common cold.

Cardiovascular diseases like heart attacks and strokes are the world's biggest killers.
High blood pressure, or hypertension, is one of the most important drivers of these diseases.
Human studies have found garlic supplements to have a significant impact on reducing blood pressure in people with high blood pressure (9Trusted Source10Trusted Source11Trusted Source).
In one study, 600–1,500 mg of aged garlic extract was just as effective as the drug Atenolol at reducing blood pressure over a 24-week period (12Trusted Source).
Supplement doses must be fairly high to have the desired effects. The amount needed is equivalent to about four cloves of garlic per day.
SUMMARYHigh doses of garlic appear to improve blood pressure for those with known high blood pressure (hypertension). In some instances, supplements may be as effective as regular medications.

Garlic can lower total and LDL cholesterol.
For those with high cholesterol, garlic supplements appear to reduce total and/or LDL cholesterol by about 10–15% (13Trusted Source14Trusted Source15Trusted Source).
Looking at LDL (the "bad") and HDL (the "good") cholesterol specifically, garlic appears to lower LDL but has no reliable effect on HDL (9Trusted Source10Trusted Source16Trusted Source17Trusted Source18Trusted Source).
High triglyceride levels are another known risk factor for heart disease, but garlic seems to have no significant effects on triglyceride levels (13Trusted Source15Trusted Source).
SUMMARYGarlic supplements seem to reduce total and LDL cholesterol, particularly in those who have high cholesterol. HDL cholesterol and triglycerides do not seem to be affected.

Oxidative damage from free radicals contributes to the aging process.
Garlic contains antioxidants that support the body's protective mechanisms against oxidative damage (19
High doses of garlic supplements have been shown to increase antioxidant enzymes in humans, as well as significantly reduce oxidative stress in those with high blood pressure (7Trusted Source9Trusted Source20Trusted Source).
The combined effects on reducing cholesterol and blood pressure, as well as the antioxidant properties, may reduce the risk of common brain diseases like Alzheimer's disease and dementia (21Trusted Source22Trusted Source).
SUMMARYGarlic contains antioxidants that protect against cell damage and aging. It may reduce the risk of Alzheimer's disease and dementia.

The potential effects of garlic on longevity are basically impossible to prove in humans.
But given the beneficial effects on important risk factors like blood pressure, it makes sense that garlic could help you live longer.
The fact that it can fight infectious disease is also an important factor, because these are common causes of death, especially in the elderly or people with dysfunctional immune systems.
SUMMARYGarlic has known beneficial effects on common causes of chronic disease, so it makes sense that it could also help you live longer.

Garlic was one of the earliest "performance enhancing" substances.
It was traditionally used in ancient cultures to reduce fatigue and enhance the work capacity of laborers.
Most notably, it was given to Olympic athletes in ancient Greece (1Trusted Source).
Rodent studies have shown that garlic helps with exercise performance, but very few human studies have been done.
People with heart disease who took garlic oil for 6 weeks had a 12% reduction in peak heart rate and better exercise capacity (23Trusted Source).
However, a study on nine competitive cyclists found no performance benefits (24Trusted Source).
Other studies suggest that exercise-induced fatigue may be reduced with garlic (2Trusted Source).
SUMMARYGarlic may improve physical performance in lab animals and people with heart disease. Benefits in healthy people are not yet conclusive.

At high doses, the sulfur compounds in garlic have been shown to protect against organ damage from heavy metal toxicity.
A four-week study in employees of a car battery plant (excessive exposure to lead) found that garlic reduced lead levels in the blood by 19%. It also reduced many clinical signs of toxicity, including headaches and blood pressure (25Trusted Source).
Three doses of garlic each day even outperformed the drug D-penicillamine in reducing symptoms.
SUMMARYGarlic was shown to significantly reduce lead toxicity and related symptoms in one study.

No human studies have measured the effects of garlic on bone loss.
However, rodent studies have shown that it can minimize bone loss by increasing estrogen in females (26Trusted Source27Trusted Source28Trusted Source29Trusted Source).
One study in menopausal women found that a daily dose of dry garlic extract (equal to 2 grams of raw garlic) significantly decreased a marker of estrogen deficiency (30Trusted Sourc
This suggests that this supplement may have beneficial effects on bone health in women.
Foods like garlic and onions may also have beneficial effects on osteoarthritis (31

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SUMMARYGarlic appears to have some benefits for bone health by increasing estrogen levels in females, but more human studies are needed.
10 helpful and proven benefits of Garlic 10 helpful and proven benefits of Garlic Reviewed by Flourishes blog on June 17, 2019 Rating: 5

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