Also known as: enfinity, 1,7-dimethylxanthine, Caffeine metabolite
Branded IngredientsEmerging evidence
The compound your body actually converts most caffeine into, sold directly rather than as caffeine. A genuinely interesting premise: skip the conversion step and the variability that comes with it.
Typical dose
100.0–300.0 mg per day
30-60 minutes before the task; clears faster than caffeine
What it is
Paraxanthine is the primary metabolite of caffeine. When you drink coffee, the great majority of the caffeine is converted by liver enzymes into paraxanthine, and much of what you feel is actually paraxanthine rather than caffeine itself.
That conversion is handled by an enzyme whose activity varies substantially between people, which is why caffeine affects individuals so differently. Some convert quickly, some slowly.
The premise of taking paraxanthine directly is that it bypasses that variable step entirely, delivering the active compound without depending on how your particular enzymes behave. That is a genuinely novel idea rather than a repackaging exercise.
How it works
Paraxanthine antagonises adenosine receptors, the same mechanism as caffeine, producing alertness by blocking the sleepiness signal.
The difference lies in the other metabolites. Caffeine also converts to theobromine and theophylline, which are associated with some of the less welcome effects including jitteriness, elevated heart rate and disturbed sleep. Taking paraxanthine directly produces those in far smaller amounts.
Paraxanthine also clears faster than caffeine, with a shorter half-life, which is the basis for the claim of less sleep disruption when taken later in the day.
What the evidence shows
Human research is early but accumulating, with trials reporting improvements in reaction time, memory and cognitive performance, and some reporting effects sustained over several hours.
Some of this work has involved academic groups rather than being solely producer-run, which is more than can be said for most ingredients in this category, though producer involvement remains substantial.
The honest position is that the mechanism is sound and well understood, the premise is genuinely clever, and the human evidence base is still small compared with caffeine's, which is one of the largest in all of sports nutrition. It is a promising ingredient rather than an established one.
Dosing
Typical range is 100 to 300 mg, with 200 mg used in much of the research. Onset is comparable to caffeine, generally within 30 to 60 minutes.
Because it clears faster than caffeine, it can reasonably be taken later in the day with less impact on sleep. That is its clearest practical advantage over caffeine.
Do not simply add it on top of your usual caffeine intake without thinking. If you are a slow caffeine metaboliser who finds coffee leaves you wired and sleepless, this is the group most likely to benefit from switching rather than stacking.
At a glance
Common forms
enfinity paraxanthine, Generic paraxanthine, Within pre-workout and nootropic blends
Half-life / duration
Shorter than caffeine, roughly 3-4 hours
Timing
30-60 minutes before the task; clears faster than caffeine
Competition status
Permitted — not on the WADA Prohibited List
Category
Branded Ingredients
Safety and side effects
Trials have reported good tolerability, with fewer reports of jitteriness and less disruption to sleep than caffeine at comparable doses. Safety assessments have not identified concerns at the doses studied.
It remains a stimulant acting on the same receptors as caffeine, so it is not a consequence-free alternative. Excessive intake will produce stimulant effects.
Long-term data is limited given how recently it entered the market. Speak to your doctor before use if your heart rhythm or blood pressure is being managed, or if you take regular medication.
Who should avoid it
Speak to your doctor before use if your heart rhythm or blood pressure is being managed, if you are prone to feeling anxious, or if you take regular medication. Do not simply stack it on top of your usual caffeine. Long-term data is limited. Not established in pregnancy or breastfeeding. Not suitable for under-18s.
This entry is provided for information only. Food supplements should not be used as a substitute for a varied and balanced diet and a healthy lifestyle. Consult a qualified healthcare professional before use if you are pregnant, breastfeeding, taking medication or under medical supervision.
