Supplement·Interactions·Reviewed June 9, 2026
Caffeine interactions.
Caffeine has 5 documented interactions in the NutriStack database: 1 to avoid or watch closely, 3 that need timing or caution, and 1 that work synergistically. The full list, with what each pairing does, is below.
Caffeine at a glance.
A quick, data-grounded summary. The full table is below.
Caffeine has 5 documented interactions in the NutriStack database: 1 to avoid or watch closely, 3 that need timing or caution, and 1 that work synergistically. The full list, with what each pairing does, is below.
Everything that interacts with caffeine.
Every supplement and medication in the NutriStack database with a documented interaction with this substance, highest-severity first. Open any pair for the mechanism and sources.
| Substance | Interaction | What happens |
|---|---|---|
| Melatonin | Conflict | Caffeine can delay sleep onset and counteract melatonin timing goals. |
| Green Tea Extract | Caution | Many green tea extracts contain caffeine and concentrated EGCG, increasing stimulant and liver-safety concerns. |
| Panax Ginseng | Caution | Both Panax ginseng and caffeine can be mildly stimulating, and combining them may amplify CNS and cardiovascular stimulation in sensitive individuals. |
| Rhodiola Rosea | Caution | Both can feel stimulating in some users and may increase anxiety or insomnia. |
| L-Theanine | Synergy | Theanine may smooth caffeine-related jitteriness while preserving attention benefits. |
The full caffeine profile.
Benefits, dosing by goal, forms, and the cited evidence for this supplement.
Common caffeine questions.
Quick answers drawn from the table above.
What interacts with Caffeine?
In the NutriStack database, Caffeine has 5 documented interactions with other supplements and medications. The most notable include Melatonin, Green Tea Extract, Panax Ginseng, Rhodiola Rosea, and L-Theanine.
What should you not take with Caffeine?
Caffeine is flagged against 1 substance in the database, including Melatonin. Review these with a clinician before combining, especially alongside prescription medications.
What works well with Caffeine?
Caffeine pairs synergistically with L-Theanine in the NutriStack database. Synergy still depends on dose and timing; open any pair for the detail.
Can you take Caffeine with Melatonin?
NutriStack classifies the Caffeine and Melatonin pairing as conflict: Caffeine can delay sleep onset and counteract melatonin timing goals. Avoid caffeine within 8-10 hours of planned sleep if insomnia-prone.
Check your whole stack
See how caffeine fits your routine.
NutriStack screens your full stack for interactions and timing conflicts, and updates the moment you change it.