Health Benefits and Side Effects of Garlic: Know Both Sides

Published: 2 Oct 2026

A single garlic clove can change the taste of an entire meal. Beyond flavor, it contains nutrients and plant compounds that offer many health benefits. At the same time, garlic does not suit everyone in the same way, and some people may notice side effects or medicine interactions.

In this blog, I’ll explain the health benefits and side effects of garlic, its nutrients, common uses, disadvantages, and important safety points. You’ll learn what makes it useful and what you should watch for.

Table of Content

Let’s learn about the good and bad sides of this vegetable.

Health Benefits of Garlic

Garlic is a common kitchen ingredient that brings flavor to meals. It also contains natural compounds that offer several health benefits as part of a healthy eating plan.

Curious about what this vegetable can do for your health? Let’s look at the key advantages of garlic:

Supports a healthy heart
Helps maintain healthy cholesterol
Supports the immune system
Provides antioxidant compounds
Supports normal blood pressure
Promotes healthy digestion
Helps the body manage inflammation
Regulates blood sugar levels
Contributes to bone health
Benefits skin health
Protects cells from oxidative stress

Here are the details of these health benefits.

1. Supports a Healthy Heart

Garlic may support heart health by promoting healthy blood flow and circulation. Adding it to meals can complement other heart-friendly foods and support heart wellness.

2. Helps Maintain Healthy Cholesterol

Garlic may help maintain healthy cholesterol levels when you follow a balanced diet. Regular use adds flavor to heart-healthy meals while providing beneficial natural compounds.

3. Supports the Immune System

Garlic contains compounds that may help your body defend itself against everyday germs. It can add useful plant compounds to your regular diet and support natural immune defenses.

4. Provides Antioxidant Compounds

Garlic contains antioxidants that help the body deal with free radicals. These compounds help protect cells from oxidative stress and support cellular health.

5. Supports Normal Blood Pressure

Garlic may help support healthy blood pressure levels as part of a healthy lifestyle. A balanced diet, regular activity, and other healthy habits also play an important role in maintaining healthy blood pressure.

6. Promotes Healthy Digestion

Garlic can add flavor to meals while contributing plant compounds to your diet. Some people also include it in meals as part of a diet that supports regular digestion.

7. Helps the Body Manage Inflammation

Garlic contains natural compounds that may help support the body’s healthy inflammatory response. This makes it a useful addition to a varied diet.

8. Regulates Blood Sugar Levels

When paired with nutritious, balanced meals, garlic may help support healthy blood sugar levels. Choosing whole foods and watching added sugar can also help maintain good blood sugar control.

9. Contributes to Bone Health

Garlic contains plant compounds and small amounts of nutrients that can contribute to a bone-friendly diet. Combining garlic with foods rich in calcium and vitamin D may help support healthy bones.

10. Benefits Skin Health

The antioxidants in garlic may help protect skin cells from oxidative stress. A nutritious diet that includes vegetables, fruits, healthy fats, and enough water can also help keep your skin healthy.

11. Protects Cells From Oxidative Stress

Garlic provides compounds that help the body handle free radicals. This antioxidant action can help protect cells from oxidative stress. These protective compounds may also support the body’s natural defenses against cellular damage.

Side Effects of Garlic

Although garlic can benefit your health, eating it may cause certain side effects, especially in people who are sensitive to it. These effects depend on the amount you eat and how your body responds to garlic.

Let’s explore the common side effects of garlic:

Bad breath
Body odor
Heartburn
Gas and bloating
Stomach upset
Nausea
Increased risk of bleeding
Allergic reactions

The following section explains each of these side effects more clearly.

1. Bad Breath

Garlic contains sulfur compounds that can leave a strong smell in your mouth after eating it. Brushing your teeth, cleaning your tongue, and drinking water may help reduce the smell.

2. Body Odor

Some compounds in garlic can enter the bloodstream and may be released through sweat. This may give your skin or sweat a noticeable garlic-like smell after eating larger amounts.

3. Heartburn

Garlic may trigger heartburn in people with a sensitive stomach. Eating large amounts, especially raw garlic, may make the burning feeling worse for some people.

4. Gas and Bloating

Garlic can cause extra gas or bloating in some people after they eat it. This effect may occur because certain carbohydrates in garlic can be difficult for some people to digest.

5. Stomach Upset

Eating garlic may cause stomach discomfort, particularly when you consume a large amount at once. People with sensitive digestion may notice this effect more easily.

6. Nausea

Some people may feel nauseous after eating garlic, especially when they consume it raw or in large quantities. Reducing the amount may help prevent this uncomfortable feeling.

7. Increased Risk of Bleeding

Garlic can affect the body’s blood-clotting process, which may raise bleeding risk for some. People who take blood-thinning medicines should discuss their garlic intake with a healthcare professional.

8. Allergic Reactions

Some people can develop an allergy to garlic after eating it or coming into contact with it. Possible signs include itching, skin irritation, swelling, or breathing problems, which require prompt medical attention.

Nutritional Values of Garlic

Garlic provides several essential nutrients, including carbohydrates, fiber, protein, vitamins, and minerals. The table below provides information on what this popular ingredient provides.

Nutrition facts of raw garlic per 100 g:

Nutrient	Amount	% Daily Value
Calories	149 kcal	7%
Protein	6.36 g	13%
Total Fat	0.50 g	1%
Carbohydrates	33.06 g	12%
Dietary Fiber	2.10 g	8%
Total Sugars	1.00 g	—
Calcium	181 mg	14%
Iron	1.70 mg	9%
Magnesium	25 mg	6%
Phosphorus	153 mg	12%
Potassium	401 mg	9%
Sodium	17 mg	1%
Zinc	1.16 mg	11%
Copper	0.30 mg	33%
Manganese	1.67 mg	73%
Selenium	14.1 µg	26%
Vitamin C	31.2 mg	35%
Thiamin (Vitamin B1)	0.20 mg	17%
Riboflavin (Vitamin B2)	0.11 mg	8%
Niacin (Vitamin B3)	0.70 mg	4%
Vitamin B6	1.24 mg	73%
Folate	3 µg	1%
Vitamin E	0.08 mg	1%
Vitamin K	1.7 µg	1%

Note: Percent Daily Values are based on current U.S. values for a 2,000-calorie diet. A dash indicates that no established daily value applies.

Best Time to Eat Garlic

There is no fixed time that everyone needs to follow when eating garlic. You can eat it at different times of the day, depending on how well your stomach handles it.

Here are some good times:

With Breakfast: Can provide naturally occurring nutrients and plant compounds.
With Lunch: Can enhance flavor and may support healthy blood pressure and cholesterol levels.
With Dinner: Can add flavor and plant compounds while making a balanced meal more enjoyable.
With Cooked Meals: Can make meals more flavorful and may be easier to tolerate for people who find raw garlic uncomfortable.
With Other Foods: Eating garlic with other foods may be more comfortable than eating raw garlic alone, especially for people with sensitive stomachs.

Bad Time to Eat Garlic

Some situations may make garlic less beneficial. Eating too much garlic at the wrong time may also cause discomfort in some people. Consider these situations when it may be better to limit or avoid it:

On an Empty Stomach: Raw garlic may cause heartburn or stomach discomfort in some people.
Before Bed: Eating a large amount late at night may cause heartburn or digestive discomfort in sensitive people.
Before Exercise: Eating a large amount of raw garlic may cause stomach discomfort in some people.
During Stomach Upset: It may be better to avoid it when you already have stomach discomfort.

Facts About Garlic

Garlic has a long history and many interesting features beyond its familiar taste and kitchen uses. These facts reveal some lesser-known details about this widely used vegetable.

Scientific Name: Garlic is scientifically known as Allium sativum and belongs to the genus Allium.
Central Asian Origin: The plant originated in Central Asia and naturally grows as far as northeastern Iran.
Bulb Structure: A garlic bulb usually contains several smaller sections called cloves, all covered by a thin papery layer.
Plant Family: Garlic belongs to the same genus as onions, leeks, and chives.
Two Types: Garlic has two main types, hardneck and softneck, each with distinct growing and storage characteristics.
Edible Plant: People eat the leaves, flower stalks, immature bulbs, and cloves in different dishes.
Strong Aroma: Crushing or grinding fresh cloves enhances their distinctive aroma and flavor.
Plant Height: The plant can grow to around 60 cm tall with long, sword-shaped leaves.
Flower Stalk: Some varieties produce a tall flower stalk called a scape with a rounded flower cluster.
Tiny Bulbils: Some garlic flowers produce small bulbils that look like tiny cloves and can help the plant reproduce.
Rare Seeds: Cultivated garlic rarely produces true seeds, so growers commonly grow new plants from cloves or bulbils.
Old Crop: Garlic is one of the oldest crops grown by people, with a history that goes back thousands of years.

Myths About Garlic

Garlic has a long history in cooking and traditional use, which has led to many popular beliefs about it. Let’s uncover well-known myths and learn what the available evidence says.

Myth No. 1: Eating garlic always prevents colds.

Truth: Research has not provided enough strong evidence to confirm that garlic prevents or treats the common cold.

Myth No. 2: All garlic has a strong, sharp taste.

Truth: Flavor can range from mild to strong depending on the variety, freshness, growing conditions, and preparation method.

Myth No. 3: More garlic means more benefits.

Truth: Eating larger amounts does not guarantee greater benefits, and too much may cause stomach problems.

Myth No. 4: Garlic can cure cancer.

Truth: No reliable evidence shows that eating garlic or taking garlic supplements can cure cancer or replace cancer treatment.

Myth No. 5: Garlic supplements work like medicines.

Truth: Garlic supplements may have small effects on some health measures, but they do not work like medicines.

Myth No. 6: Raw garlic is always better.

Truth: Raw garlic can cause heartburn, upset stomach, and other digestive discomfort in some people.

Conclusion

In short, this blog covers the key facts about the health benefits and side effects of garlic, including its pros and cons, the best time to consume it, when to be cautious, useful facts, and common myths.

Garlic adds plenty of flavor and provides useful nutrients, but those taking certain medications or supplements may need to be more cautious when consuming it. Following a balanced approach can help you enjoy garlic while staying mindful of its potential drawbacks.

Frequently Asked Questions

Here, you’ll find answers to common questions about garlic’s benefits and side effects.

Is garlic good for you every day?

For most people, eating garlic in moderate amounts is generally safe. You can include it as part of a varied and balanced diet. Taking large amounts through supplements requires more care because supplements can have side effects and interact with medicines.

How should I choose fresh garlic?

Look for firm bulbs with dry, clean outer skin and no soft or damaged areas. Avoid bulbs that feel mushy or show signs of mold. Fresh, firm bulbs usually store better than damaged ones.

How to store garlic in the refrigerator?

Place peeled cloves in an airtight container before refrigerating them. Use them within about 2 weeks to maintain their quality. Whole garlic bulbs usually keep longer in a cool, dry place outside the refrigerator.

Why does garlic turn green after cutting?

Garlic may turn green inside the clove as it gets older or starts to sprout. This change does not always mean the garlic has spoiled. Check for mold, a bad smell, or a soft texture before eating it.

What is the difference between hardneck and softneck garlic?

Hardneck garlic produces a firm central stalk and often develops edible flower stalks called scapes.
Softneck garlic does not usually produce a central flowering stalk and often stores well.

Both types include many different varieties with their own flavors and growing features.

Can I grow garlic from a garlic clove?

Yes, you can plant an individual clove to grow a new garlic plant. Place the clove in suitable soil with the pointed end facing upward. The planted clove can develop roots, leaves, and eventually a new bulb.

What are garlic scapes?

Garlic scapes are the curly flower stalks that some hardneck garlic plants produce. You can harvest and eat them while they are still tender. They add a mild garlic flavor to dishes.

What is black garlic?

Black garlic starts as regular garlic and develops its dark color and sweet, soft texture through controlled heating and aging. This process changes its flavor and texture considerably. It tastes much milder and sweeter than fresh garlic.

Can I eat garlic leaves?

Yes, young garlic leaves are edible and can add a mild garlic flavor to meals. You can chop them and add them to salads, soups, sauces, or cooked dishes. Their flavor usually tastes milder than mature cloves.

Why does chopped garlic smell so strong?

Cutting or crushing garlic triggers chemical reactions that create its strong aroma. These reactions form sulfur-containing compounds that give the plant its distinctive smell and taste. Crushing the cloves generally releases more of these flavor compounds than leaving them whole.