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There are no dosage guidelines for l-theanine, but many supplements recommend taking 100–400 mg per day. Anyone looking to consume l-theanine in tea should keep the FDA’s caffeine guidelines in mind. Some evidence suggests that this combination helps boost cognitive performance and alertness. L-theanine may work well when paired with caffeine. Alpha waves may contribute to a relaxed yet alert mental state. People can also take l-theanine supplements.Ī 2016 review reported that l-theanine may increase alpha waves in the brain. L-theanine is an amino acid that occurs in black and green teas. Studies have found that consuming 4 or more servings of caffeine a day is linked to a higher risk of pregnancy loss. Women who are pregnant or may become pregnant may need to limit or avoid caffeine intake. Taking them can lead to a caffeine overdose and even death, in rare cases. This is the amount in 4–5 cups of coffee.Ĭaffeine pills and powders can contain extremely high amounts of the stimulant. The Food and Drug Administration (FDA) recommend that people consume no more than 400 milligrams (mg) of caffeine a day.

However, extreme amounts of caffeine may not be safe. Having a regular cup of coffee or tea may be a good way to boost mental focus. Studies suggest that caffeine is safe for most people in moderate amounts. Many people consume beverages that contain caffeine, such as coffee or tea, because of their stimulant effects. The following sections discuss nootropics that do not require a prescription. The term “nootropic” can also refer to natural or synthetic supplements that boost mental performance. Healthcare providers should work closely with people taking prescription nootropics to manage any side effects and monitor their condition. Some evidence suggests that people who use prescription nootropics to improve brain function have a higher risk of impulsive behaviors, such as risky sexual practices. Like any prescription medications, they carry risks of side effects and interactions, and a person should only take them under a doctor’s care.Ĭommon side effects of prescription nootropics include: While these can be effective in treating specific medical conditions, a person should not take them without a prescription. memantine (Axura), which treats symptoms of Alzheimer’s disease.methylphenidate ( Ritalin), a stimulant that can manage symptoms of narcolepsy and ADHD.Adderall, which contains amphetamines to treat ADHD.modafinil ( Provigil), a stimulant that addresses the sudden drowsiness of narcolepsy.Usually, the drug is a type of stimulant, such as an amphetamine, that can help treat ADHD, narcolepsy, dementia, or a similar condition. Share on Pinterest A person may take a nootropic to treat ADHD, narcolepsy, or dementia.Ī doctor may prescribe a nootropic to treat a medical condition.