Amino Acid Methionine: Benefits and Side Effects

The essential amino acid methionine is important for fat breakdown, metabolism, and heavy metal removal. The amino acid helps to make organs work better . Methionine is found in foods like fish, eggs, cereal, and nuts. It also boosts protein.

Doctor talking to a patient

Is your body getting enough amino acid methionine? Fun Fact: Fish, nuts, and kidney beans are good sources of this essential amino acid. It’s an EAA because people have to get it from food. This differs from nonessential amino acids (NEAAs) that the body produces naturally. There are 9 EAAs including the branched-chain amino acids (EAAs) that have been trending in recent years. Methionine is important for the function of various organs like the kidneys and liver. It also has other functions that are critical for the human body to work properly. Meanwhile, having low levels of the amino can cause various health issues related to skin, hair, and liver health.

Methionine is one of the essential amino acids (EAAs). There are 9 of them and people have to get them from food and supplements since the body doesn’t produce them. While BCAAs are probably the most well-known EAAs they just make up one-third of the total EAAS. Besides functioning as an amino acid methionine supplements are sometimes prescribed to vegans/vegetarians as a protein source. It’s important for the human body to get all the needed amino acids. That includes EAAs that must be consumed from food since the body doesn’t make them.

What Exactly Is Methionine?

This is an amino acid that’s protein-based. It helps with various body functions including fat break-down, and heavy metal removal. This helps to make sure that different organs like the kidneys, liver, and bladder are working effectively.

There are other benefits of this amino acid. For example, methionine is important for healthy hair, skin, and nails. It’s also important for energy and muscle growth. Since the body doesn’t make this amino acid. People can only get them from food. They include:

  • Cereals
  • Eggs
  • Eggs
  • Kidney Beans
  • Nuts
  • Salmon

You can also boost your levels of the amino through other sources. They include dietary supplements or IV therapy provided by a doctor. It’s important to maintain a high level of the amino acid.

There are different medical uses of this amino. They include poison-caused liver damage. This substance is usually found in over-the-counter (OTC)/prescription painkillers. If someone has had an overdose of the substance patients usually must take methionine within 10 hours to avoid liver damage.  

If you don’t have a high enough level of this amino acid you can have various health issues. Methionine can cause various health issues. They include ones related to skin, hair, and liver. You might also have other issues including mental conditions. So it’s important to make sure you’re getting enough of this amino acid from food and supplements.  

Methionine is also used in alternative medicine. It can help vegans/vegetarians increase their protein levels. It’s also helpful for heavy drinkers and can function as a protein replacement.  Another use is for patients with ADHD. It can also provide other benefits like getting rid of heavy metals and improving muscle function.  

The amino acid can also provide other benefits. They help nerves work better and improve memory. Sometimes methionine supplements are prescribed to patients with Alzheimer’s or Parkinson’s disease. These are serious diseases that can cause various mental symptoms among patients.

Amino Acid Methionine: Benefits


Consuming a diet high in folate (Vitamin B) and methionine might help to lower the risk of colon cancer. It’s mostly true when colon cancer runs in the family. Another high risk is people who are heavy drinkers. In both cases consuming the amino acid and vitamin seems to lower the risk of cancer.  


Everyone has the blues now and then. However, depression is a deep sadness that doesn’t go away. This is a clinical condition that can be dealt with using different treatments. One is methionine, which might help to boost mood and help escape deep despair.


These conditions are different but can have similar symptoms. There’s some evidence that methionine can help to treat allergies and asthma. They can cause various symptoms like breathing issues. These are the ones you’ll want to deal with. This amino acid is one of the various treatments you can use.


The liver is one of the vital organs of the human body. It’s important to take steps to make sure your liver is functioning properly. Certain amino acids seem to be key in helping to boost liver function. That includes methionine.

Liver cirrhosis is one of the most common conditions linked to liver diseases. It’s often linked to heavy drinking. However, it can also be linked to non-heavy drinkers.


Nitrous oxide is a substance that provided during surgery as a kind of anesthesia. Studies show that long-term exposure can have a similar effect as Vitamin B12 deficiency. Some studies show that taking this supplement prior to surgery can help to reduce nitrous oxide’s side-effects.


Some studies show that taking this amino supplement for a maximum of 6 months can help with Parkinson’s symptoms. They include movements, rigidity, and tremors. These are key benefits that can help with Parkinson’s patients.   

Methionine: Side Effects

1. Supplements/Drugs

If you’re taking supplements/drugs already it’s important to find out if they could cause any issues when taking. Sometimes that’s possible due to “interactions.” These are caused when the chemicals of methionine supplements mix with supplements/drugs you’re already taking. This could result in negative results that you’ll likely want to avoid.

2. Drowsiness

This is a symptom that some people experience from the supplement. There are many causes of feeling sleepy. They include medications, temperature, and lack of sleep. If you take these amino supplements there’s a chance you could experience drowsiness. So if you start feeling sleepy all the time after you start this supplement you should get it checked out.  

3. Existing Conditions

If you have some like liver disease then it’s important to know how the amino could affect your condition. This includes any prescription meds you’re taking. It’s important to find out if there are any “interactions” that could happen.

4. Breathing/chest issues

If you experience symptoms like chest tightness/breathing problems you should get it checked out immediately. The reason these are signs of serious allergic reactions to the amino acid. It’s one thing to have small symptoms. However, these are the ones that can affect your heart/lungs so they’re issues to take up immediately.  

5. Pregnancy/Breastfeeding

It’s highly recommended to consult your doctor first if you’re pregnant/breastfeeding before you start taking this amino acid supplement. The problem is it’s unclear how pregnant/breastfeeding women could be affected by the supplement. It could be serious.

6. Nausea/Vomiting

These are some of the most frequent kinds of side-effects that people might experience when taking the amino acid. These are very common symptoms of different health conditions. So if you experience them it’s important to figure out the real cause. There’s a chance it could result from supplements that include the amino acid methionine.

Amino Acid Methionine, Benefits and Side Effects

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