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Methionine (supplement)

Last updated on 16/07/2021.

Overview   |   Dosage   |    Side Effects   |   Precautions  |   Tips  |   Where To Buy  

GENERIC NAME: Methionine, L-methionine, D-methionine

CHINESE NAME: 甲硫氨酸, 蛋胺酸

BRAND NAME(S) IN HONG KONG: L-Methionine 蛋氨酸, Lipochol 利寶肝

DRUG CLASS: Supplements

SUB CLASS: Amino acid derivatives

USED FOR: Nutritional supplementation, Paracetamol (Acetaminophen) poisoning

What is Methionine for?

Methionine is an essential amino acid found in many meat, fish, and dairy products. Amino acids are the building blocks that our bodies use to make proteins. Essential amino acids cannot be made by the body and must be obtained from food and nutritional supplements. There are two types of methionine, L-methionine (the naturally occurring form) and D-methionine. While both forms contain the same chemical makeup, our bodies can only convert the L-methionine into protein, hence L-methionine is more commonly seen in nutritional supplements.

Methionine plays an important role in many cell functions and is required for growth and tissue repair. It is essential for the absorption of Selenium and Zinc.  It improves the tone and pliability of skin, hair, and strengthens nails. Methionine also plays a role in many detoxifying processes. It protects cells from pollutants and heavy metals, such as lead and mercury, and is also used to prevent liver damage in Paracetamol (Acetaminophen) poisoning.

How to use it?

Methionine is commonly available as tablets or capsules which may be taken by mouth. The daily recommended intake of methionine (with another amino acid called cysteine) is 14 mg per kg body weight for adults, and 22-27 mg per kg body weight for children aged 2 or above. For specific dosages, please refer to specific product labels.

What are the side effects of Methionine?

Taking Methionine supplements may cause nausea and vomiting, drowsiness and irritability.

Who should not take Methionine?

– Patients with acidosis
– Patients with severe liver diseases or liver failure

Pharmacist Tips:

– It is always best to consult your doctor or pharmacist before starting any supplement, especially if you already take medication, have health concerns, or are pregnant.
– Most people should obtain adequate amounts of Methionine from a healthy diet as all foods contain some methionine. Some foods that contain the highest amount of Methionine include fish, meat, and eggs.

Common dosing schedule:
Please refer to specific product instructions.

Some common medications Methionine may interact with:
Methionine has no known significant interactions with other medications.

Where to buy Methionine in Hong Kong?

In Hong Kong, Methionine is an over-the-counter medicine and 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

Need more information?

For detailed information about the use of Methionine (supplement) 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.