Hello, Thanks for reaching out ! Yes -  magnesium glycinate, L-theanine, and melatonin are generally safe to take together, and they can be taken daily for most healthy adults when used in appropriate doses. Why this combination is commonly used 1. Magnesium glycinate helps relax muscles and the nervous system and may reduce nighttime restlessness. 2. L-theanine promotes calmness and reduces mental hyperarousal without causing sedation. 3. Melatonin helps regulate the sleep- wake cycle, especially sleep onset.

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Hello Sir For improving quality of sleep Medicines are not the first choice to go for. There are various not medical management techniques to improve the sleep quality which has good results overall

For sleep disturbances, you can follow sleep hygiene along with melatonin 3 or 5 mg Other two medications if prescribed by a Psychiatrist can be continued with melatonin Sleep hygiene means certain lifestyle modifications you must follow On net you can read regarding it

Hi. Yes they can be taken. Consult online for questions regarding the same