NutraKey - Caffeine - 100 Capsules

NutraKey Caffeine is 99.9% pure, ultra-micronized Caffeine Anhydrous — 200mg per capsule, 100 capsules per container, nothing else. No sugar. No calories. No artificial colors. No fillers. No crash from a sugar spike and drop. HPLC certified for purity. Each capsule delivers the caffeine equivalent of approximately two cups of coffee in a clean, fast-absorbing anhydrous form. Take 1 capsule as needed. Do not exceed 4 capsules (800mg) in any 24-hour period. Non-GMO. Gluten free. BPA free. Manufactured by NutraKey in Orlando, FL, USA.*

Supplement Facts — NutraKey Caffeine (Per 1 Capsule / 100 Servings)

• Caffeine Anhydrous (99.9% Pure, Ultra-Micronized, HPLC Certified) — 200mg

• Other Ingredients: Gelatin (capsule)
• No fillers. No artificial colors. No dyes. No preservatives. No GMOs. Gluten free. BPA free. Parabens free.
• 100 capsules per container — 100 single-capsule servings
• Take 1 capsule as needed. Do not exceed 4 capsules (800mg) in any 24-hour period.
• HPLC certified purity — 99.9% pure Caffeine Anhydrous confirmed by lab testing
• Manufactured in Orlando, FL, USA

Why Caffeine Anhydrous Capsules Versus Coffee or Energy Drinks

Coffee and energy drinks are caffeine delivery vehicles surrounded by variables — varying caffeine content per cup or can, added sugar, cream, artificial flavors, preservatives, carbonation, and significant caloric load from sweetened versions. A can of a mainstream energy drink delivers 80-200mg of caffeine alongside anywhere from 25-55g of sugar and 100-220 calories. A latte at a coffee shop delivers caffeine alongside hundreds of calories of milk and syrup depending on the order. The caffeine dose in both cases is inconsistent and the caloric and sugar payload is significant — particularly relevant for athletes monitoring caloric intake or carbohydrate loading during a diet phase.†

NutraKey Caffeine delivers a precisely measured 200mg dose in every capsule with zero calories, zero sugar, zero carbohydrates, and zero additional compounds. The dose is fixed and known — no variability from cup size, brewing method, or barista discretion. For athletes who use caffeine as a controlled ergogenic tool rather than a habitual beverage, the capsule format provides dose precision, caloric neutrality, and portability that no beverage format matches.†

What Caffeine Does — Performance, Fat Loss, and Cognitive Function

Central Nervous System Stimulation — The Primary Mechanism

Caffeine is a xanthine alkaloid that functions as a competitive antagonist at adenosine receptors — primarily A1 and A2A receptors in the brain and peripheral nervous system. Adenosine is an inhibitory neuromodulator that accumulates in the brain throughout the waking day, progressively increasing drowsiness and reducing arousal as adenosine receptor occupancy increases. Caffeine blocks adenosine from binding to these receptors, preventing the inhibitory signal and maintaining the excitatory neurotransmitter activity (dopamine, norepinephrine, acetylcholine) at higher baseline levels. The result is the alertness, reduced perception of fatigue, improved reaction time, and enhanced sustained attention that caffeine is universally recognized for. These effects begin within 15-45 minutes of ingestion and peak at approximately 60-90 minutes.†

Athletic Performance — Endurance, Strength, and Power

Caffeine's ergogenic effects on athletic performance are among the most consistently documented in sports science research — the evidence base spans hundreds of peer-reviewed studies across decades and multiple exercise modalities. The International Society of Sports Nutrition (ISSN) position stand on caffeine identifies it as the most evidence-backed performance supplement in sports nutrition. Key documented effects include improved endurance performance (reduced RPE at the same workload, increased time to exhaustion in aerobic exercise), improved anaerobic performance (sprint speed, power output, vertical jump), improved strength performance (increased one-rep max and training volume in resistance training), and improved reaction time and skill execution in sport-specific tasks.†

The glycogen-sparing effect is one of caffeine's most practically relevant mechanisms for endurance athletes. Research from the Human Performance Laboratory at Ball State University documented up to a 100% increase in plasma free fatty acids after a 330mg caffeine dose — meaning the body preferentially mobilized and oxidized stored fat for fuel rather than drawing down muscle glycogen. Preserving glycogen for later in a training session or event allows athletes to maintain higher intensities for longer before glycogen depletion limits performance. For strength athletes, caffeine's phosphodiesterase inhibition (raising intracellular cAMP) amplifies the contractile response of muscle cells, contributing to the strength and power output improvements documented in the literature.†

Fat Metabolism and Body Composition

Caffeine is the most active ingredient in the majority of commercially available fat burners — not because of marketing convention but because it has the most robust evidence for fat mobilization and thermogenic effect of any legal dietary compound. Caffeine stimulates lipolysis (the breakdown and release of triglycerides from fat cells into the bloodstream) through beta-adrenergic receptor activation and phosphodiesterase inhibition, raising free fatty acid availability for oxidation. It increases metabolic rate (resting energy expenditure) by approximately 3-11% dose-dependently, with effects lasting several hours after ingestion. At 200mg, a single NutraKey Caffeine capsule produces a meaningful thermogenic and lipolytic effect that contributes to daily caloric expenditure and fat mobilization.†

Cognitive Performance and Mental Focus

Beyond its physical performance effects, caffeine's cognitive benefits are equally well-documented. Caffeine at 100-200mg doses improves sustained attention, vigilance, working memory speed, and reaction time in multiple peer-reviewed trials in both sleep-deprived and normally-rested subjects. The cognitive effects of caffeine are particularly relevant for use cases beyond training — studying, demanding work tasks, early morning cognitive demands, or any situation requiring sustained mental output. At 200mg, a single NutraKey Caffeine capsule provides cognitive performance enhancement without the excessive stimulant load that produces jitteriness or anxiety in sensitive individuals.†

Ultra-Micronized Anhydrous — Why Formulation Quality Matters

Caffeine Anhydrous is the dehydrated, crystalline form of caffeine — identical active compound to that found in coffee and tea but without the water and plant matrix. Anhydrous caffeine absorbs faster and more reliably than caffeine from beverages because it doesn't need to be extracted from a complex food matrix during digestion. NutraKey's ultra-micronization further accelerates absorption by reducing particle size to the micron range — maximizing surface area contact with intestinal fluid and speeding the rate of dissolution and uptake. The 99.9% purity (HPLC certified) confirms the absence of the synthesis byproducts and impurities that appear in lower-grade caffeine sources. HPLC certification means every batch is independently tested by high-performance liquid chromatography — the analytical standard used in pharmaceutical quality control.†

Dosing Guide — How to Use NutraKey Caffeine Effectively

The optimal caffeine dose for performance enhancement in most research is 3-6mg per kilogram of body weight — for a 180lb (82kg) individual, this corresponds to approximately 246-492mg. A single NutraKey capsule (200mg) covers the lower end of the effective range and is appropriate as a standalone dose for moderate caffeine tolerance users. Two capsules (400mg) covers the upper research range for most body weights and is appropriate for experienced caffeine users with higher tolerance, though 400mg is a significant stimulant load and should be approached carefully by users who don't already consume high amounts of caffeine daily.†

NutraKey's hard limit of 4 capsules (800mg) in 24 hours is a safety ceiling, not a recommended dose. The FDA has identified 400mg as the generally recognized safe daily caffeine intake for healthy adults. Do not approach 800mg as a regular daily intake — this ceiling represents the maximum safety boundary under any circumstances, not a target.†

Timing: take 30-45 minutes before the activity requiring peak alertness or performance. Caffeine's half-life is 3-5 hours — a 200mg dose at 4pm will still have meaningful active caffeine at 7-9pm, which is relevant for sleep quality if you are sensitive to caffeine's sleep-disrupting effects. Avoid taking NutraKey Caffeine within 6 hours of your intended bedtime.†

Frequently Asked Questions

1. How does 200mg of Caffeine Anhydrous compare to coffee?
   A standard 8oz drip coffee contains approximately 80-120mg of caffeine depending on the roast and brew strength. An espresso shot is approximately 60-70mg. A 200mg NutraKey Caffeine capsule is roughly equivalent to 1.5-2.5 cups of coffee — in a fixed, measured, calorie-free dose that doesn't vary based on brewing variables. The anhydrous form also absorbs somewhat faster than caffeine from coffee because it doesn't need to be extracted from the beverage matrix during digestion.†
2. Can NutraKey Caffeine be stacked with pre-workouts that already contain caffeine?
   Only with caution and awareness of total caffeine intake. If your pre-workout contains 300mg of caffeine, adding one NutraKey Caffeine capsule brings the total to 500mg — a high but not dangerous dose for high-tolerance users. Adding two capsules brings it to 700mg — approaching the 800mg 24-hour ceiling. Always account for caffeine from all sources (coffee, pre-workout, energy drinks, NutraKey Caffeine) when calculating your total daily intake. For most users the NutraKey Caffeine is best used as a standalone morning energy or focus tool on non-training days, or as the primary caffeine source on days when using a stimulant-free pre-workout.†
3. Will I build tolerance to NutraKey Caffeine?
   Yes — caffeine tolerance develops with regular daily use. Adenosine receptors upregulate (increase in number and sensitivity) with chronic caffeine exposure, requiring progressively higher doses to achieve the same subjective effect over time. Cycling off caffeine periodically — typically 1-2 weeks off every 6-8 weeks of regular use — resets adenosine receptor sensitivity and restores the full ergogenic and cognitive effect at the baseline dose. During a caffeine cycling break, the NutraKey Beta Alanine twice-daily protocol, creatine, and non-stimulant pre-workouts can maintain training performance without caffeine.†
4. Is NutraKey Caffeine appropriate for tested athletes?
   Yes. Caffeine was removed from WADA's prohibited list in 2004 and is currently a permitted substance in all competitive sports. It is on WADA's monitoring program (meaning WADA tracks usage patterns) but is not prohibited at any dose. NutraKey Caffeine's single-ingredient, HPLC-certified purity formula has no cross-contamination risk from prohibited substances. Tested athletes can use NutraKey Caffeine with confidence.†

How to Take NutraKey Caffeine

Take 1 capsule with water as needed for energy, focus, or performance support. For pre-workout use: take 1 capsule 30-45 minutes before training. For cognitive performance: take 1 capsule 30-45 minutes before demanding mental work. Do NOT exceed 4 capsules (800mg) in any 24-hour period — caffeine can be toxic at very high doses. Do not take within 6 hours of bedtime. Not for persons under 18. Not for pregnant or nursing women. Not for individuals sensitive to stimulants, with cardiovascular conditions, high blood pressure, or anxiety disorders. Consult a physician before use if taking any prescription medications. Individuals with caffeine sensitivity should start with half the dose — open the capsule and use half the powder if needed.*

Why Buy at Get Yok'd

• Real-time inventory across all five Southern California stores
• Available in Burbank, Glendale, Glendale Galleria, Pasadena, and North Hollywood
• Authorized NutraKey retailer
• Staff who can help you build a complete supplement stack around NutraKey's single-ingredient lineup
• One of the best loyalty programs in the supplement industry — earn rewards on every purchase

Who Should Not Take NutraKey Caffeine

• Not for persons under 18 years of age
• Not for pregnant or nursing women
• Not for individuals with cardiovascular conditions, high blood pressure, or heart arrhythmia
• Not for individuals with anxiety disorders, panic disorder, or PTSD — caffeine amplifies anxiety in susceptible individuals
• Not for individuals with insomnia or sleep disorders without physician guidance
• Do not combine with other high-caffeine products without calculating total daily intake
• Do not exceed 4 capsules (800mg) in any 24-hour period under any circumstances
• Individuals taking MAO inhibitors or certain psychiatric medications should consult a physician before use
• Keep out of reach of children — caffeine is toxic to children at doses far below the adult safety threshold

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.