#caffeine

10 articles

A wide, editorial-style flat lay photographed from above on a pale oat-colored linen surface in soft morning window light. On the left, a small matte white ceramic cup of black coffee with a delicate swirl of steam, beside a few scattered roasted coffee beans. On the right, a second matte sage-green ceramic cup holding a pale, creamy golden tea-like drink, mirroring the first. Between them, two small glass vials with cork stoppers sit side by side: one holding fine white powder, the other holding slightly warmer cream-colored powder, with a tiny brass measuring spoon resting nearby. In the lower foreground, a slim wooden rowing oar lies diagonally across the frame, its blade edge softly entering from the right, painted a muted navy with a thin terracotta stripe. A minimalist analog stopwatch with a brushed-steel case rests near the oar, and a folded cream notebook with a thin pencil suggests data-taking. In the upper corner, a crescent-shaped dried eucalyptus sprig and a small folded gray wool throw hint at sleep and calm without being literal. The palette is warm and restrained: oat, cream, sage, soft navy, terracotta, and espresso brown. Shadows are long and gentle, with shallow depth of field and subtle film grain, giving a refined, modern wellness-magazine feel. Generous negative space on the left third of the composition leaves room for a headline overlay. Clean, calm, tactile, and contemporary, with no text, logos, or futuristic elements.

Paraxanthine vs Caffeine: The Combo That Won, and the Sleep-Saver

BY DR. GYMBRO · Oct 31, 2026

Paraxanthine, caffeine's main metabolite, just went head-to-head with caffeine in a trial of 14 rowers. The combo of 200 mg each beat placebo on a 2000-m row, but only with a small effect (d = 0.30). Neither compound alone clearly improved performance. Paraxanthine alone, however, looked friendlier to subjective sleep. Here are the numbers, the limits, and who might actually benefit.

A sunlit outdoor running track in late afternoon, shot from a low angle with shallow depth of field. In the foreground, a matte black bottle with a minimal off-white label sits on the edge of a warm terracotta-colored track lane, beside a folded white towel and a small glass of amber liquid catching golden light. Condensation beads on the bottle. A faint heat shimmer rises from the track surface and softens the background.

In the midground, slightly out of focus, a lean athlete in a sage-green tank top and charcoal shorts runs on a treadmill-like stretch of track, a thin sheen of sweat on their shoulders, their expression focused and calm. Their motion is gently blurred, suggesting endurance and rhythm. Long soft shadows stretch across the lane lines.

The background fades into hazy peach, apricot, and pale yellow tones, with the suggestion of tall trees and a distant stadium wall. Warm sun flare enters from the upper right, creating a subtle glow and a few soft light streaks across the frame.

Subtle editorial touches: a small notebook with a pencil and a stopwatch rest beside the bottle, hinting at data and timing without any text legible. The color palette is warm and muted, with terracotta, cream, sage, and charcoal accents, and a fine film-like grain. The composition leaves open negative space on the left third for a headline overlay. The overall mood is clean, modern, and health-journal inspired, natural and aspirational, with a calm scientific curiosity rather than hype.

nutrition

Ketone Drinks in the Heat: Longer Endurance and Sharper Memory?

BY DR. GYMBRO · Oct 30, 2026

Ketone drinks are supposed to be for fat-burning biohackers, but a new heat-stress trial suggests they might also help you finish stronger. In 17 trained men, ketone monoester plus caffeine extended time to exhaustion to 8.9 minutes versus 7.0 with carbs plus caffeine, after 90 minutes of loaded treadmill work at 34 °C. Working-memory accuracy on the 1-back task improved too, while heart rate and core temperature didn't differ meaningfully. But 2-back, reaction time and the hit-and-avoid task showed no benefit, and the study was small, male-only and single-session. Here's what the data show, and what they don't.

A wide editorial still life on a pale, warm-toned concrete surface in soft morning window light. In the center-left, a shallow matte ceramic bowl holds a small pile of bright red coffee cherries with glossy skins, a few sliced open to reveal pale mucilage and paired green-tan beans. Beside it, a small glass dish of fine, golden-brown powdered extract with a tiny wooden scoop resting on its edge. A sprig of coffee plant leaves, deep green and waxy, arcs across the foreground.

On the right side, slightly out of focus, a sleek road cyclist's handlebar and a matte black water bottle lean against a light plaster wall, suggesting athletic training without showing a person. A minimalist analog stopwatch with a clean white face and thin black hands sits in the mid-ground, angled toward the camera, its hands paused near the fifteen-minute mark. A folded linen cloth in oatmeal beige and a single small espresso cup with a thin crema ring add quiet texture.

The color palette is restrained and modern: cherry red, sage green, cream, soft terracotta, and charcoal accents. Light comes from the left, casting long, gentle shadows with a subtle warm glow and a hint of dust in the air. Shallow depth of field with crisp focus on the cherries and stopwatch, creamy bokeh in the background. Composition leaves open negative space in the upper right for a headline overlay. The overall feel is a clean, trendy health-and-science magazine cover: tactile, natural, minimal, and calm, shot in a 16:9 landscape frame with fine film-like grain and true-to-life tones.

nutrition

Coffee Cherry Extract: 200 mg Caffeine Lifted Cycling Output 4.6%

BY DR. GYMBRO · Oct 30, 2026

A low 200 mg caffeine dose from whole coffee cherry extract helped trained cyclists produce 4.6% more work in a 15-minute time trial. But the popular idea that it speeds up glycogen refuelling didn't hold up. This randomized, double-blind crossover trial involved just 12 cyclists and was industry-funded, with no plain-caffeine comparison group. Here's what the data show, what they don't, and who might want to try it.

A sleek aluminum energy drink can and a matte scoop of white pre-workout powder sit side by side on a pale concrete gym bench, lit by soft morning window light. The can is slim and minimalist, with a muted sage green label and no legible text. Beside it is a clear glass shaker half full of cloudy, lightly frothy liquid with condensation beading on its surface. A few fine grains of powder are scattered across the bench, catching the light. Behind them, slightly out of focus, a stainless steel barbell rests on a rack, and a folded charcoal gym towel sits at the edge of the frame.

The color palette is warm neutral: oatmeal, soft gray, and sage, with a single accent of pale citrus yellow from a halved lemon wedge placed near the glass. A thin, elegant shadow from the window blinds falls diagonally across the scene, giving it an editorial, magazine-style rhythm. The composition leaves generous negative space on the right third of the frame, a smooth blurred wall in warm off-white, suitable for headline text overlay.

The shot is a low-angle, shallow depth-of-field product-style photograph, as if taken with an 85mm lens at f/2. The foreground objects are tack sharp and the background melts into creamy blur. The mood is calm, clean, and modern, like a wellness or science journal feature. Subtle film grain and gentle contrast add a tactile, contemporary lifestyle feel. There are no people, no logos, and no futuristic or sci-fi elements, just a quiet, considered still life that suggests the choice between a canned drink and a scooped supplement.

nutrition

Your Energy Drink May Work Like a Pre-Workout—With One Catch

BY DR. GYMBRO · Oct 29, 2026

Caffeine and taurine sit side by side in energy drinks and pre-workouts, but does the pair actually boost performance? A new meta-analysis of 11 randomized trials (234 participants) found moderate improvements in peak power and time to exhaustion, plus lower perceived effort. Heart rate didn't budge, and the reaction-time result was too inconsistent to trust. The catch is that the studies were small and can't show whether taurine adds anything beyond caffeine. Here's what the data say, and who should think twice.

A landscape editorial photograph with a modern, clean magazine feel, shot on a pale warm-gray concrete surface in soft natural window light from the left. In the foreground, two matte white ceramic espresso cups sit side by side. The left cup holds a small amount of dark espresso with golden crema. The right cup is filled twice as high. Beside them, two small stainless steel scoops hold fine coffee-colored powder, one half full and one heaped, suggesting a dose comparison without any text or labels. A pair of worn red leather boxing gloves rests slightly out of focus behind the cups, laces loosely draped, with a white hand wrap rolled neatly beside them. A minimalist digital kitchen scale in matte black sits at the edge of the frame, with a few roasted coffee beans scattered across the surface. In the soft-focus background, a boxing gym corner appears: a hanging heavy bag in muted charcoal, pale wood plank flooring, and a tall window with diffused morning light. The palette is warm cream, espresso brown, brick red, and soft slate gray, with gentle shadows and a shallow depth of field. The composition follows the rule of thirds, with the cups and scoops in the lower left third and open negative space on the right for headline overlay. The look is tactile and refined, like a high-end health and performance journal. It has natural grain, subtle contrast, and a calm, confident mood. There are no people, no text, no logos, and no futuristic elements.

nutrition

Doubling Your Caffeine Barely Helped Boxers—Here's What Did

BY DR. GYMBRO · Oct 27, 2026

Think a double scoop of pre-workout means double the performance? A new crossover trial in 15 competitive boxers compared 3 mg/kg and 6 mg/kg of caffeine, and the bigger dose was not consistently better. Both doses raised jump height and power at 60 minutes, while 6 mg/kg only pulled ahead on a few outcomes like ballistic push-up power and knee torque. Here is the mg-per-kg conversion for common body weights, the timing the data supports, and the honest caveats, including that punching itself was never tested.

A sunlit, minimalist kitchen counter in a modern home, photographed from a slightly elevated three-quarter angle with soft natural morning light spilling in from a window on the left. In the center sits a matte white ceramic mug of black coffee with a thin curl of steam, beside a small glass jar of deep magenta beetroot powder with a wooden scoop resting on the lid. A scattering of fine crimson powder dusts the pale oak surface in an artful, casual swirl. Nearby, a halved raw beetroot reveals vivid concentric rings of purple and pink, next to a few roasted coffee beans and a neatly folded charcoal gym towel. In the soft-focus background, a pair of clean white running shoes and a stainless steel water bottle sit on a floating shelf, hinting at a pre-workout routine. A single sprig of green beet leaves adds a fresh accent.

The color palette is warm and editorial: creamy neutrals, espresso browns, and rich beet magenta, with gentle highlights and long soft shadows. The composition has generous negative space on the right side for headline text, shallow depth of field, and a crisp, tactile texture on the ceramic, powder, and wood grain. The mood is calm, health-conscious, and contemporary, like a lifestyle feature in a premium wellness magazine or a trendy nutrition journal. Clean, balanced, natural, with subtle film-like grain and a slightly muted, high-end finish.

science research

Pre-Workout Caffeine Stiffens Arteries. Beetroot Powder Offset It

BY DR. GYMBRO · Oct 26, 2026

A new randomized crossover trial found that a pre-workout-sized dose of caffeine (6 mg/kg) raised markers of arterial stiffness within 2.5 hours. Adding a beetroot powder with 400 mg of nitrate brought those markers back to placebo levels. Blood pressure and endothelial function did not change, so this is a subtle effect rather than a red flag. The study involved just 24 healthy young adults and a single dose, leaving big questions about long-term use and older or hypertensive people. Here is what the data show, what they do not, and how to think about it if you rely on caffeine before training.

A wide, editorial-style still life shot from a slightly elevated angle on a pale oak gym bench, bathed in soft morning window light. In the center sits a matte ceramic cup of black coffee with delicate steam curling upward, flanked by a small white scoop of coffee beans and two identical glass vials, one filled with a few grains of fine powder and one empty, hinting at dose comparison. Next to the cup rests a pair of worn white boxing hand wraps, loosely coiled, and a slim black stopwatch with its face softly visible. In the foreground, a minimalist notebook lies open with blurred handwritten numbers and a simple pen sketch of a bar graph with bars of equal height, subtle and unreadable, suggesting a null result without any legible text. A small brass kitchen scale sits to the side with a few coffee beans on its tray.

In the soft-focus background, a boxing gym interior is visible: a hanging heavy bag in muted charcoal, exposed brick wall painted off-white, and tall windows casting long diagonal light across the floor. The color palette is warm and restrained: cream, sand, espresso brown, soft charcoal, with a single accent of muted terracotta orange in the hand wraps and a faint sage green in the notebook cover. Shallow depth of field with creamy bokeh, fine film grain, and gentle shadows give it a contemporary lifestyle-magazine and wellness-journal feel. The composition leaves generous negative space on the left third for headline overlay. Clean, calm, trendy, and tactile, with natural textures like wood grain, ceramic glaze, and cotton fabric. No people, no text, no futuristic elements.

science research

Low-Dose Caffeine Coffee Gave Elite Fighters Zero Sprint Boost

BY DR. GYMBRO · Oct 23, 2026

Think your pre-workout coffee is supercharging your sprints? A new randomized, double-blind crossover trial in 15 national-level combat athletes found no performance benefit from caffeine doses of 1.5 and 3 mg/kg, about 100 and 200 mg for a 68 kg athlete. Peak power, mean power, fatigue index and even estimated energy system contributions did not differ from decaf. But this is a small null result, not proof that caffeine fails, and most positive studies use capsules at 3–6 mg/kg. Here is the dose math, the caveats and what to actually do before your next hard session.

A wide, softly lit editorial flat-lay on a pale warm-gray stone countertop, shot from slightly above. On the left, a small rustic ceramic bowl in matte cream holds a handful of dried guarana seeds, dark glossy brown with pale cream arils, a few spilling onto the surface. Beside it sits a halved fresh guarana fruit in vivid red-orange, split open to show the white flesh and black seed inside, looking like a tiny eye. On the right, two open clear capsules rest side by side. One is filled with fine white caffeine powder, the other with a fine earthy brown guarana powder, and a little of each dusts the stone in delicate, deliberate lines. Between them, a minimalist matte-black espresso cup with a thin ribbon of steam rises on the right edge of the frame. A brushed-steel stopwatch and a slim dark-green linen notebook with a pencil sit in the upper background, slightly out of focus, to hint at performance testing without clutter. A few green leaves of a guarana vine curve in from the top-left corner, catching soft light.

The lighting is natural window light from the left, with gentle long shadows and a subtle warm highlight on the seeds. The palette is muted and modern: warm creams, terracotta red, deep espresso brown, sage green, and charcoal accents. The background is clean with generous negative space on the upper right for headline text. Shallow depth of field, crisp focus on the seeds and capsules, fine grain, and a calm premium magazine look like a contemporary wellness and sports-science journal. No people, no text, no logos, no futuristic elements.

science research

Guarana vs Caffeine: Same Dose, Only Guarana Lifted Peak Power

BY DR. GYMBRO · Oct 22, 2026

Same caffeine dose, different capsule, and only guarana produced a statistically significant boost in peak power. In a randomized crossover trial of 18 active men, guarana raised peak power output by 4.0% over placebo while anhydrous caffeine did not reach significance. But here's the catch: guarana didn't significantly beat caffeine head-to-head, and the differences between them were only descriptive. Here's what the numbers show, where the study falls short, and how to dose guarana by caffeine content if you want to try it.

A wide, editorial-style flat lay on a warm, matte cream stone surface, shot from slightly above in soft natural morning light. On the left, a ceramic espresso cup in muted terracotta holds dark coffee, with a few roasted coffee beans scattered beside it. In the center, a small wooden board holds three bright red chili peppers, one sliced open to show pale seeds, next to a small pile of coarse red pepper flakes. On the right, a pair of minimalist off-white running shoes with sage green accents rests at an angle, and a slim stopwatch with a clean white face lies in front of them. Three small matte white capsules sit in a neat row at the center of the composition, a quiet nod to the placebo and the active doses. Soft shadows fall to the lower right. A sprig of dried eucalyptus and a folded linen cloth in oatmeal tones add texture at the edges. The palette is warm and restrained: terracotta, chili red, cream, sage, and charcoal brown, with a gentle pop of red as the focal accent. The depth of field is shallow, so the foreground beans are slightly soft and the chilies and capsules stay crisp. The mood is clean, modern, and magazine-like, in the style of a contemporary health and science journal. There is no text, no people, and no logos, and plenty of negative space on the upper left and right edges leaves room for a headline overlay.

nutrition

Caffeine + Capsaicin Beat Placebo in a 10K. Capsaicin Alone Didn't

BY COACH RYAN · Oct 17, 2026

A chili-pepper compound plus caffeine was the only combo that beat placebo over 10 km in a new crossover trial, yet capsaicin alone did nothing. Caffeine drove the statistical effect, and there's no proof of synergy. The dose, 6 mg/kg, works out to roughly 450 mg for a 75 kg runner, which is a lot. Insomnia, anxiety, headaches, and racing heart showed up more often with caffeine. Here's what the 20-runner study found and who should skip it.

A wide, editorial-style flat lay photographed from slightly above on a pale oak gym bench with a soft matte finish. On the left, a small white ceramic cup of black coffee sits on a matching saucer, with a thin curl of steam rising and catching warm window light. Beside it is a second, slightly larger handleless stoneware mug in muted sage green, also filled with coffee, so the pair suggests one to two cups. In the center-right foreground rests a sleek matte-black steel barbell plate, partly overlapping a brushed-steel dumbbell with fine knurling. A folded charcoal gym towel and a clean white chalk-dusted wrist strap lie casually to one side. A small scatter of whole roasted coffee beans spills across the bench in front of the cups, glossy and deep brown. Near the bottom edge, a minimalist analog kitchen scale in soft cream with a thin black needle hints at precise dosing, without any readable numbers or text.

Soft morning sunlight streams in from the upper left, creating long, gentle shadows and a warm golden glow against cool neutral tones. The background is a softly blurred, airy home gym or boutique training studio with out-of-focus squat rack uprights, pale concrete walls, and a leafy green plant in a terracotta pot adding a touch of organic color. The palette is restrained and modern: warm cream, espresso brown, charcoal, sage green, and hints of brushed silver. Shallow depth of field keeps the cups and beans tack sharp while the background melts into creamy bokeh. The composition leaves generous negative space on the right third for a title overlay, with a balanced, calm, premium magazine feel, like a contemporary wellness and sports science journal. High-resolution, natural color grading, subtle film grain, realistic textures on ceramic, steel, and coffee crema.

nutrition

How Much Caffeine Before Lifting? A Meta-Analysis Says 1–2 mg/kg Still Works

BY DR. GYMBRO · Oct 15, 2026

The standard advice for caffeine before lifting is 3–6 mg/kg, which can mean several cups of coffee or a heavy scoop of pre-workout. A 2022 meta-analysis of 12 trials found that doses of just 0.9–2 mg/kg still improved muscular strength (d ≈ 0.17), muscular endurance (d ≈ 0.21), and mean bar velocity (d ≈ 0.56). For many lifters, that's about one to two cups of coffee. The effects are modest and the evidence comes from acute, single-session studies, but the findings suggest you may be able to get a similar benefit with less caffeine.