Medicines & Supplements A to Z > Garlic (Supplement)

Garlic (Supplement)

Last updated on July 30, 2019.

Overview   |   Dosage   |   Side Effects   |   Where To Buy  

GENERIC NAME: Garlic / Allium sativum



What is Garlic for?

Garlic is a plant that can be taken as a supplement. The active ingredient in Garlic that can give health benefits is called allicin. It can help lower the level of bad cholesterol (LDL) and has antiplatelet effects. It hence can be used as a supplement if you have high cholesterol or high blood pressure. There are also claims saying that Garlic might help prevent common colds and cancers. Still, there is limited scientific evidence to support these claims.

How to use it?

Garlic supplements are taken by mouth in the form of tablets or capsules. The usual adult dose is 300-1000 mg. For specific dosages, refer to the product label.

What are the side effects of Garlic?

Side effects of Garlic as supplement include heartburn, stomach upset, breath and body odor, headache and dizziness. Garlic might also increase the risk of bleeding. Advise your doctor or pharmacist before taking a Garlic supplement if you are currently taking any antiplatelet drugs (e.g. Aspirin, Clopidogrel) or anticoagulant drugs (e.g. Warfarin) as it can increase bleeding risks.

Where to buy Garlic in Hong Kong?

In Hong Kong, Garlic supplements can be purchased without a prescription from any retail outlet in Hong Kong. This includes grocery stores, convenience stores, medicine shops, and pharmacies. It can also be obtained from doctors. To find a pharmacy near you, refer to the list of pharmacies (“Authorized Sellers of Poisons”) from the Hong Kong Department of Health.

For more information about drug names and ingredients, you can visit Hong Kong’s Drug Office at

For detailed information about the use of Garlic in children, pregnancy and breastfeeding, and for questions about drug interactions, please check with your pharmacist or doctor.

Disclaimer: our goal is to provide you with the most relevant drug information and common dosage for Hong Kong. This information does not constitute medical advice. For specific treatment recommendations and advice, always discuss with your doctor or pharmacist, and follow the instructions included with your specific medicine.