Protein & Nutrition Blog – Marmels
Protein & Nutrition Blog – Marmels
Does Dark Chocolate Help With Focus? What Studies Show
by Mo Mandegar, PhD
on Sep 22 2026
At three in the afternoon, a square of 70% stops being a snack and becomes a strategy. The research behind that instinct is real but narrower than the headlines: cocoa flavanols changed brain oxygenation in a 2020 trial, and improved performance only on the hardest task. Here is what each study actually dosed, and how far a 40-gram serving sits from it.
