Medically reviewed by Drugs.com. Last updated on Mar 3, 2019.
What are other common names?
- Boletus badius
- Camellia sinensis
- Gamma-ethylamino-L-glutamic acid
What is this product used for?
L-Theanine is used by some people to help lower anxiety and as a sleep aid. Others believe it helps with the immune system. Some people believe it may help prevent cancer. L-Theanine is used by some people to help relax.
What are the precautions when taking this product?
Always check with your doctor before you use a natural product. Some products may not mix well with other drugs or natural products.
Do not use this product if you are pregnant or plan to become pregnant soon. Use birth control you can trust while taking this product.
Do not use this product if you are breastfeeding.
Avoid beer, wine, and mixed drinks (alcohol) while taking this product.
This product may cause you to be sleepy. Take extra care driving and doing tasks that you need to be alert for.
Take extra care and check with your doctor if you have:
What should I watch for?
When do I need to call the doctor?
Signs of a very bad reaction. These include wheezing; chest tightness; fever; itching; bad cough; blue skin color; seizures; or swelling of face, lips, tongue, or throat. Go to the ER right away.
Signs of low blood pressure. These include feeling dizzy, weak, or tired; fainting; more thirst; or skin that is pale, cool, and clammy.
Very bad throwing up
Very bad loose stools
Very bad headache
Change in your ability to think clearly
Last Reviewed Date
Consumer information use
This information is not specific medical advice and does not replace information you receive from your healthcare provider. Only your healthcare provider has the knowledge and training to provide advice that is right for you. You should not rely on this information in deciding whether or not to use, or accept your healthcare provider’s advice regarding use of, any natural products or similar treatments, therapies, or life-style choices. This information does not endorse any natural products or similar treatments, therapies, or life-style choices as safe, effective, or approved for treating any patient or health condition. This is only a brief summary of general information. It does NOT include all information about natural products, possible uses, directions, warnings, precautions, interactions, adverse effects, or risks that may apply to you. You must talk with your healthcare provider for complete information about your health and treatment options.
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