Melatonin — Stack & Timing
Educational timing and stacking information based on how Melatonin has been studied. Not a prescription. Not medical advice.
This is educational information only, not medical advice. Melatonin is a hormone — individual responses vary substantially. The appropriate use of melatonin depends on the specific sleep-related goal, existing circadian phase, and individual health context. Consult a healthcare provider before use, especially if taking other medications or managing a sleep disorder.
Stack & Timing Guidance
Educational summary based on how Melatonin has been studied and commonly used.
Commonly studied timing
Timing relative to desired sleep time is more critical than dose. For sleep onset: take 30-60 minutes before the intended sleep time. For jet lag: take at the local destination bedtime beginning the night of arrival (or the night before for eastward travel). Do NOT take in the morning or early afternoon in a standard sleep schedule, as this may phase-delay the circadian clock. Taking with a heavy meal may slow absorption of immediate-release formulations.
Dose ranges used in studies
Physiological nighttime melatonin levels are in the 100-200 pg/mL range. Even 0.5mg produces serum levels substantially above this. For circadian phase shifting and sleep onset, 0.5-1mg is a reasonable starting point — evidence does not support the assumption that 5-10mg doses are more effective. For jet lag, doses up to 5mg have been used in trials. Extended-release formulations are sometimes used for sleep maintenance (vs. onset), though evidence for this distinction is limited. Sublingual formulations may offer faster onset.
↑ These are ranges from research studies, not personal dosing recommendations. Discuss with a clinician.
Commonly paired with
Complementary sleep mechanisms — melatonin addresses circadian timing while magnesium may support GABA-mediated relaxation and reduce cortisol. One of the most commonly discussed sleep stacks in the evidence-informed wellness community.
Note: No direct RCT of the combination; both have independent moderate evidence for sleep-related outcomes. No known adverse interaction.
L-theanine is associated with alpha-wave promotion and reduced anxious arousal, which may support the transition to sleep initiated by melatonin. Commonly combined in low-dose evening sleep stacks.
Note: Combination not tested in RCTs. L-theanine evidence for sleep quality is moderate (independent studies). No known adverse interaction at typical doses.
Safety & interactions
At low doses (0.5-1mg), melatonin is well-tolerated by most adults for short-term use. At higher doses (5-10mg), next-day grogginess, headache, and nausea are more common. Chronic use at any dose should be approached with caution given limited long-term safety data. Avoid in children and adolescents without medical guidance. Autoimmune conditions: melatonin has immunomodulatory effects and may interact with the immune system in ways that are not fully characterized. Not a substitute for sleep hygiene, light exposure management, or treatment of underlying sleep disorders.
- •Warfarin and other anticoagulants: Melatonin may increase bleeding risk — monitor INR if on warfarin
- •Immunosuppressants (e.g., cyclosporine): Melatonin has immunomodulatory properties and may interfere with immunosuppressant therapy
- •Hormonal contraceptives: May increase melatonin levels; combination may potentiate sedative effects
- •Diabetes medications (insulin, metformin): Melatonin may affect glucose regulation and insulin sensitivity — monitor blood glucose closely
- •CNS depressants (benzodiazepines, alcohol, antihistamines): Additive sedation risk; use with caution
- •Fluvoxamine (SSRI): May significantly increase melatonin plasma levels via CYP1A2 inhibition — dose adjustment may be needed
Not recommended for children or adolescents without medical supervision. Caution in individuals with autoimmune disease, bleeding disorders, or those on immunosuppressant therapy. Pregnant or breastfeeding individuals should consult a healthcare provider before use.