Benefits
Appetite control
In two small trials, obese participants taking yeast hydrolysate recorded lower calorie intake than the control group, which is the likely route to any weight effect. Both trials came from the group that developed the ingredient.
Weight-management support
In a 10-week placebo-controlled trial of about 54 obese adults, 1 g/day cut body weight by roughly 2.6 kg and reduced abdominal fat more than placebo; a smaller trial in 30 women at 0.5 g/day showed similar reductions. Both trials were small and came from the ingredient's developers, with no independent confirmation.
Limited-evidence note
The human evidence is two small trials from the academic group that developed the ingredient, with no independent replication, so keep expectations modest.
Mechanism of action
Satiety-hormone signaling
In rats, yeast hydrolysate altered appetite-related signals in the hypothalamus (including neuropeptide Y). In the human trials the measured effect was lower energy intake; specific satiety hormones such as CCK or GLP-1 have not been shown to change with this ingredient in people.
Appetite regulation
In the human trials, participants taking yeast hydrolysate recorded lower food intake than the control group.