Caffeine (Xanthine Alkaloid · Cognitive Performance · Athletic Ergogenic)

Compound	Caffeine
Chemical class	Alkaloid — Purine (Xanthine; 1,3,7-Trimethylxanthine)
CAS	58-08-2
Primary source	Coffea arabica (coffee beans), Camellia sinensis (tea), Paullinia cupana (guarana)
Key applications	Cognitive performance, athletic performance, thermogenic, adenosine antagonist
Claim strength	High
Typical form	Caffeine anhydrous; natural caffeine from green coffee/guarana extract
Buy from Herbuno	Natural Caffeine 98% Powder → Green Coffee Extract Powder - Coffea arabica →

Commercial source: Caffeine is commercially available as natural caffeine from green coffee (Coffea arabica) bean extraction and from guarana (Paullinia cupana) seed extraction. See sourcing options below. Traditional use: Coffee, tea, and guarana preparations have been consumed for their stimulant effects for centuries across multiple global cultures — Arabic coffee culture from the 15th century, Chinese tea from antiquity, and South American guarana use by indigenous Amazonian peoples. Caffeine’s stimulant mechanism (adenosine receptor antagonism) was only understood in the 20th century, but the beverages’ wakefulness-promoting and performance-enhancing properties were well-recognised empirically. Research trajectory: Caffeine has the most extensive evidence base of any psychoactive supplement ingredient — thousands of controlled studies in humans covering cognitive performance, athletic performance, thermogenesis, and safety. It is one of the most consumed psychoactive substances globally and is included in the EFSA-approved health claim framework. See sourcing options below.

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Evidence for Caffeine Applications

Cognitive performance and alertness: EFSA-approved health claim: “Caffeine contributes to an increase in alertness and attention concentration.” Condition: 75 mg per serving. Multiple meta-analyses confirm caffeine improves reaction time, sustained attention, working memory, and mood at doses of 75–200 mg. Effect is primarily via adenosine A1 and A2A receptor antagonism, removing adenosine’s inhibitory tone on dopamine and noradrenaline neurotransmission. Claim strength: High.

Athletic performance: EFSA-approved health claim: “Caffeine contributes to an increase in endurance performance” and “...endurance capacity.” Condition: 3 mg/kg body weight. Meta-analyses confirm caffeine improves time-trial performance by ~3–4%, time to exhaustion by ~12%, and maximal strength by ~3–4% in trained athletes. One of the most robust performance ergogenic effects in sports nutrition research. Claim strength: High.

Thermogenic and fat oxidation: Caffeine increases metabolic rate by 3–11% and fat oxidation by ~13% over 3 hours at doses of 100–400 mg. Beta-3 adrenoceptor activation and phosphodiesterase inhibition (increasing cAMP) are primary thermogenic mechanisms. Effect diminishes with tolerance development. Relevant for weight management and fat burner formulations. Claim strength: High.

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Dosage & Formulator Specification

Effective human dose range: 75–400 mg per serving depending on application. EFSA cognitive claim: minimum 75 mg/serving. EFSA athletic performance claim: 3 mg/kg body weight (210 mg for a 70 kg adult). European Food Safety Authority notes that habitual caffeine intake up to 400 mg/day is not associated with safety concerns in healthy adults; single doses up to 200 mg are not of safety concern for pregnant women.

Natural caffeine from green coffee or guarana extract is chemically identical to synthetic caffeine anhydrous. For “natural caffeine” label positioning, specify source (green coffee extract, guarana seed extract) on the label. Green Coffee Extract from Herbuno contains caffeine alongside chlorogenic acids — relevant for formulations seeking both stimulant (caffeine) and metabolic (chlorogenic acid) activity from a single botanical source.

Caffeine is safe and well-tolerated at supplement doses in healthy adults. Common adverse effects at higher doses (>400 mg): anxiety, insomnia, tachycardia, GI discomfort. Contraindicated in pregnancy above 200 mg/day. Drug interactions: MAOIs (risk of hypertensive crisis at high caffeine doses), fluoroquinolone antibiotics (CYP1A2 inhibition prolongs caffeine half-life). Standard advisory language for pregnant women and sensitive populations required.

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Frequently Asked Questions — Caffeine

Is natural caffeine from green coffee extract any different from synthetic caffeine anhydrous?
The caffeine molecule is identical regardless of source. “Natural caffeine” from green coffee, guarana, or tea extraction is the same 1,3,7-trimethylxanthine as synthetic caffeine anhydrous. The distinction is primarily for clean-label positioning and consumer preference rather than pharmacological difference. Natural source caffeine co-extracts may contain minor co-alkaloids (theobromine, theophylline) at low levels depending on extraction purity.

Does caffeine tolerance develop and how does it affect supplement efficacy?
Yes — regular daily caffeine use leads to adenosine receptor upregulation within 1–2 weeks, reducing the alertness and stimulant magnitude of any given dose while shifting the effect baseline. Athletic performance effects are partially but not fully subject to tolerance. Cycling (periodic caffeine withdrawal) or rotating between caffeine-containing and caffeine-free products can partially restore sensitivity. This is a practical consideration for chronic supplement users.

What is the pharmacokinetic profile of caffeine relevant to pre-workout timing?
Caffeine oral bioavailability is essentially 100%. Tmax: 30–60 minutes after consumption. Half-life: 3–5 hours (highly variable; CYP1A2 genotype-dependent; smokers metabolise 2-fold faster; oral contraceptives inhibit metabolism). For pre-workout application, timing 30–60 minutes before exercise achieves peak plasma caffeine at training commencement. For afternoon/evening sports, half-life means late caffeine doses can impair sleep quality — relevant for product advisory language.

Can caffeine be combined with theobromine and other xanthines?
Yes — this is a common and rational supplement formulation strategy. Caffeine (fast-acting, high potency, ~3.5 hour half-life) combined with theobromine (slower-acting, lower potency, ~7 hour half-life) provides a staggered stimulant profile with extended but smoother energy. Adding paraxanthine (the primary caffeine metabolite) alongside caffeine is an emerging approach for improved CNS targeting. Co-formulation of xanthines from different botanical sources (coffee, cocoa, guarana) allows clean-label natural sourcing declarations for each.

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Claim-strength scale – High = multiple human RCTs; Moderate = limited trials or strong preclinical convergence; Emerging = early-stage lab or animal data.

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