Because green coffee extract still carries some caffeine alongside chlorogenic acid, most studies look at the two together. A randomised, placebo-controlled crossover trial found low and moderate doses of coffeeberry extract, alongside a caffeine comparison, were tested for their effects on cognition, mood and subjective energy in healthy adults. Longer-term human research on chlorogenic acid specifically found that 16 weeks of daily supplementation was associated with meaningful improvements in psychomotor speed and executive function compared with placebo — one of the first studies of its kind to isolate this compound's effect on cognition rather than caffeine's.

Inositol plays a structural and signalling role in brain cells, which is the basis for its studied effects on mood and cognitive function. Clinical research summarised in a recent review notes a correlation between brain inositol levels and the body's ability to manage anxiety symptoms, with the clearest clinical signal seen in studies using higher, medically supervised doses for specific conditions like panic disorder. At the food and beverage level, inositol is best understood as a well-tolerated, naturally-occurring contributor to the same signalling pathways involved in calm, clear thinking — one piece of Focus's approach to mental clarity rather than the headline act on its own.