Is L-theanine good for stress and sleep?
For everyday mental stress and mild sleep problems, multiple studies support 200 mg of L-theanine per day. For an anxiety disorder or serious sleep complaints, the evidence is too thin to rely on without guidance from your doctor.
Yes, for everyday mental stress and mild sleep problems, L-theanine is worth trying. Choose a capsule or tablet containing pure L-theanine, with 'L-Theanine 200 mg' on the label. If you want to try it for stress or sleep, take 200 mg per day and give it at least four weeks. It is better to avoid combination products with multiple ingredients: with those, you cannot tell whether it is the L-theanine that is doing anything. According to the research, it makes no difference whether you are male or female.
A study of 30 healthy adults (200 mg per day, four weeks) found less stress, a shorter time to fall asleep and less sleep disruption compared with a placebo. A systematic review of nine studies confirms the effect on stress. However, two of the researchers worked for the manufacturer of the product, and another study saw no effect of 200 mg during an intense, physically activating stressor in virtual reality. L-theanine therefore appears to work better for mental, everyday stress than for severe or acute physical pressure.
Doses of 200 to 400 mg per day for up to eight weeks appear to be safe. A review article reports no liver toxicity for this amino acid at that dosage, in contrast to green tea extracts. Long-term data are still lacking.
Do you have a generalised anxiety disorder and are you already taking antidepressants? In research, people with that condition received 450 to 900 mg per day as a supplement to an antidepressant for eight weeks, but that did not work better than a placebo for anxiety symptoms. Discuss this with your doctor.
Based on 2 systematic reviews, 5 randomised controlled studies and 1 narrative review. One RCT has a conflict of interest (manufacturer paid the authors). One RCT involving a combination supplement cannot be attributed to L-theanine alone.
How much melatonin should you take to sleep better?
If you want to try melatonin for difficulty falling asleep, 4 mg taken 3 hours before bedtime gives the best chance of effect; if you are 55 or older, only the extended-release form is officially recommended. Always discuss this with your doctor, as it concerns the treatment of a sleep disorder.
Does creatine affect your sleep?
Creatine may improve how you experience your sleep, but objective measurements show no effect. The research is based on dozens of participants and the results are contradictory; do not use it as a sleep aid.
Does magnesium really help you sleep better?
Magnesium may be worth trying for sleep problems, but the evidence is limited and the studies are partly contradictory. At normal doses it is safe; in any case, make sure you get enough through your diet.
Does melatonin improve sleep in older age?
For older people with sleep complaints, particularly waking up too early, melatonin offers a modest but real benefit. The effect varies by person and complaint, so always discuss use and duration with your doctor.
Does apigenin help you sleep better?
There is currently no evidence that apigenin as a supplement meaningfully improves sleep in humans. Animal research is promising, but the only randomised study in humans showed no effect, so caution is warranted.
Does magnesium glycinate help you sleep better?
Magnesium may offer some benefit for sleep in certain people who are deficient or have a medical condition, but this has not been demonstrated for healthy people without a deficiency. If you have had poor sleep for years, first discuss with your doctor whether other causes may be involved.