#guarana

1 article

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.

Guarana vs kofein: při stejné dávce zvedla jen guarana špičkový výkon

BY DR. GYMBRO · 22. 10. 2026

Stejná dávka kofeinu, ale různé kapsle – jen guarana přinesla statisticky významné zvýšení špičkového výkonu. V randomizované křížové studii na 18 aktivních mužích guarana zvýšila maximální výkon o 4 % oproti placebu, zatímco anhydrový kofein významný efekt neprokázal. V přímém srovnání však guarana nebyla statisticky lepší; rozdíly jsou pouze popisné. Níže se dozvíte, co čísla ukazují, jaké jsou omezení studie a jak dávkovat guaranu podle obsahu kofeinu, pokud ji chcete vyzkoušet.