Can I take Melatonin and Theacrine together?

Yes, if you separate them in time. Melatonin and Theacrine have a documented timing-sensitive interaction. Theacrine taken late can oppose melatonin-supported sleep onset.

What kind of interaction is it?

Timing-sensitive: the two substances can be taken on the same day but should be separated by a minimum time window.

Is this interaction backed by published research?

Yes. NutriStack lists 1 citation row for the Melatonin + Theacrine pair, each linking to PubMed by PMID where available. Full sourcing methodology at https://nutristackapp.com/methodology/interactions.

Supplement × Supplement·timing-sensitive·Emerging evidence

Melatonin + Theacrine

Q: How does this affect a NutriStack Stack Score?

-5 to your Stack Score per scored timing-sensitive row.

Timing Sensitive Emerging evidence

Theacrine taken late can oppose melatonin-supported sleep onset.

Supplement × Supplement

Open the interaction checker → Read the methodology

From the database

What the row says.

Every entry follows the same shape: what is happening, the mechanism, and the recommendation.

Substances

Melatonin and Theacrine

Pair type

Timing Sensitive

Evidence

Emerging

Source citations

Scope

Supplement × Supplement

Last verified

June 4, 2026

Timing SensitiveEmerging evidence

What is happening. Theacrine taken late can oppose melatonin-supported sleep onset.

Mechanism. Arousal-promoting adenosine/dopamine effects can counter sleep-timing signals.

Recommendation. Take theacrine in the morning and melatonin only near bedtime if needed.

Timing

Timing & separation.

Space the doses apart by at least this window to avoid the conflict.

Minimum separation

Stack Score

How it moves the number.

Effect on the composite score

If both Melatonin and Theacrine are in the same stack, this pair applies −5 to your Stack Score (per scored timing-sensitive row).

The full algorithm, the clamping rules, and four worked stacks are at /methodology/stack-score.

Sources

Sources, by evidence tier.

Every claim on this page is cited. PMIDs link straight to PubMed.

Reference material

1Kuhman DJ et al. Theacrine supplementation study. Journal of Dietary Supplements. 2015.Needs sourceNo link

Check your full routine

One pair was the worked example.

Drop your supplements and prescriptions into NutriStack and it runs every pair at once: every interaction, synergy, timing rule, and contraindication, each linked to its primary source.

Open the interaction checker → Browse the research index