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Fénix Methode

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← All supplements
PerformanceStrong evidence

Caffeine

Also known as: caffeine anhydrous, guarana

Caffeine is a stimulant found naturally in coffee, tea and guarana that blocks adenosine receptors and reduces the feeling of tiredness. It is one of the best-studied performance aids.

What it is used for

  • Alertness and attention (EFSA-authorised claim) – strong evidence
  • Endurance performance (EFSA-authorised claim) – strong evidence
  • Strength and interval performance – moderate evidence
  • Fat burning – weak evidence

Forms and how they differ

caffeine anhydrous

precisely dosed, fast onset

caffeine from guarana, green tea or coffee

natural sources; the effect is the same as pure caffeine

caffeine + L-theanine

combination for calmer alertness without jitters

When to take it

In the morning or 30–60 minutes before training; take the last dose at least 8 hours before bed.

Pairs well with

Works well with L-theanine and creatine.

Do not combine / separate

Do not combine with other stimulants or caffeinated pre-workouts. Keep a gap from iron, calcium and thyroid medicine.

Watch out for

Limit total intake in pregnancy and breastfeeding. If you have high blood pressure, heart rhythm problems, anxiety, liver disease or take medicines, consult your doctor.

Safety

According to EFSA, single doses up to 200 mg and up to 400 mg per day are safe for healthy adults; in pregnancy up to 200 mg per day. Count coffee and energy drinks too.

Practical tip

If you use caffeine daily, take a week off now and then – your sensitivity will return.

Products containing Caffeine 8

Maltodextrin + Caffeine 40 gmaltodextrin/fructose gel · 40 g / servingEnduranceEnergyRecoveryFocus
Caffeinenatural caffeine shotEnergyFocusEnduranceWeight & satiety
Caffeine + Lion's mane + Chagainstant blendEnergyFocusEnduranceWeight & satiety
CaffeineEnergyFocusEnduranceWeight & satiety
Caffeine anhydrous + L-theanine 200 mganhydrous + L-theanine · 200 mg / capsuleEnergyFocusEnduranceWeight & satiety
Caffeine guarana + green tea + coffee extract 200 mgguarana + green tea + coffee extract · 200 mg / capsuleEnergyFocusEnduranceWeight & satiety
Caffeine anhydrous 200 mganhydrous · 200 mg / tabletEnergyFocusEnduranceWeight & satiety
Caffeine + L-theaninenatural caffeineEnergyFocusEnduranceWeight & satiety
How to read the evidence rating
Strong evidenceModerate evidenceWeak evidenceNo evidence

Strong = several good human studies or official recommendations; moderate = promising but smaller studies; weak = few studies or mixed results; no evidence = claims not confirmed.

Combination check

Select the supplements you take and, if relevant, your medicines. We show what interferes, what needs a time gap and what to watch out for.

Check Caffeine with others

Which supplements do you actually need?

Fénix Methode picks them from your blood results and schedules when to take what – no needless purchases.

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From the same group

AmylopectinModerate evidenceBeta-alanineStrong evidenceBHB ketonesWeak evidenceCreatineStrong evidenceD-aspartic acidWeak evidenceDamianaWeak evidence
Important notice

This information is educational and does not replace advice from a doctor or pharmacist. We do not give medicine dosages. Supplements are no substitute for a varied diet; if pregnant, breastfeeding, ill or on medication, consult a doctor first.