circadian
3 interactions related to circadian
propranolol + melatonin
Propranolol blocks the beta-adrenergic signal the pineal gland uses to make melatonin at night, lowering the body's own nighttime melatonin.
metoprolol + melatonin
Metoprolol blocks the beta-1 adrenergic receptors the pineal gland uses to receive its nighttime signal to make melatonin, so it tends to suppress your own melatonin and can contribute to insomnia and vivid dreams. A randomized trial in beta-blocker-treated patients found that low-dose bedtime melatonin improved sleep without interfering with metoprolol's cardiovascular benefits. This is a beneficial, low-concern combination rather than a harmful clash.
melatonin + magnesium
Melatonin provides a circadian timing signal while magnesium supports a calmer nervous system, so the two target different parts of the sleep problem and are commonly combined. The pairing is generally well tolerated short term, though rigorous proof of a specific two-ingredient synergy is limited.