In two double-blind studies, a pre-geriatric study with 184 patients and a pre-Alzheimer study with 75 patients, the results in the herbal yeast groups demonstrated improvements within about three months in the following areas: short-term memory, recovery behaviour/circulatory efficiency (ergometry test), fatigue, dizziness, mental alertness, sleep, emotional stability, apathy.
Pelka R. B., Pre-geriatric study, results of a double-blind study with Bio-Strath® in patients with pre-geriatric problems, NOTABENE MEDICI, No. 3 and 4, 1990 Pelka R. B., Leuchtgens H., Pre-Alzheimer study, results of a double-blind study with Bio-Strath® in pre-Alzheimer patients, ARS MEDICI, No. 1, 1995