Adenosine
Adenosine is a nucleoside made of adenine and the sugar ribose. It occurs in every cell, is a building block of ATP and also acts as a signaling molecule.
What it is studied for
The strongest rated effects first. Bars show the size of the effect, the letter grades the evidence, and each rating lists the studies behind it.
A signal linked to the need for sleep
Adenosine rises in the brain during wakefulness and is broken down during sleep. NHLBI describes it as one contributor to sleep pressure, the growing drive to sleep after time awake. The body clock and light cues also influence sleep timing. 1
Why people take it
SuppCo community snapshot, 2026-09-28. Reasons for use are not evidence that it works.
Questions people ask
Is adenosine the same as melatonin?
No. NHLBI describes adenosine as linked to accumulating sleep pressure and melatonin as a hormone released with darkness to signal sleep timing. 1
Does caffeine remove adenosine?
The NIH explanation emphasizes blocking its action on brain cells, which reduces the sensation of sleepiness. 2
What dose should I take for sleep?
The reviewed sources do not establish an oral sleep dose. Intravenous medical dosing is not a substitute for that missing evidence. 1 3
Does medical use prove supplement safety?
No. The reviewed injection is used for a specific diagnostic purpose with significant warnings and monitoring requirements. It does not validate an oral supplement. 3
Sources
- What Makes You Sleep? NHLBI
- Tired or Wired? Caffeine and Your Brain NIH, 2020
- Adenosine injection: prescribing information DailyMed, 2025