Interaction · Supplement
Caffeine + Melatonin: separate the timing
Opposing circadian signals — the afternoon cutoff protects the melatonin window.
- Overall grade
- Grade C
- Last revised
- 0
- graded outcomes
- 0
- references listed
Assembled by the app from other entries in this library. It adds no evidence of its own — follow the links to the entries it draws on.
What is uncertain
Read off the same rows as above. Nothing here is added that the entry does not itself record.
The evidence in words
The interaction
Caffeine and Melatonin — a timing interaction. Opposing circadian signals — the afternoon cutoff protects the melatonin window.
What to do
They are fine to use in the same regimen, but not at the same time. Separate the doses (typically by 2–4 hours) so one does not block the other's absorption.
About Caffeine
Caffeine is a plant alkaloid and the world's most consumed psychoactive drug. It reliably increases alertness, reduces perceived effort, and improves endurance and some strength and reaction-time measures.
The bigger picture
Supplement–drug and supplement–supplement interactions are the reason a stack should be read as a system, not a list. This platform's interactions graph maps them; the medication side always belongs with the person who prescribes it.
Related reading
Entries that share this one's tags or conditions.
- Glycine + Melatonin: separate the timingBoth pre-bed and compatible — glycine 60–90 min out, melatonin ~30.Evidence grade C
- Iron + Caffeine: separate the timingCoffee polyphenols cut non-heme iron ~40% — separate 2 hours.Evidence grade C
- Activated Charcoal + Oral contraceptives: separate the timingAdsorbs oral drugs — separate by hours to avoid failure.Evidence grade C
- Caffeine + ADHD stimulants: use with cautionAdditive stimulation and cardiovascular strain on top of prescription stimulants.Evidence grade B
Sources
This entry lists no references of its own — it is assembled from the entries it links to, whose sources are on their pages.
Last revised . A grade is this entry's reading of the evidence, not medical advice.