Mice that got the supplement had higher levels of genes that help burn calories in their brown fat compared to mice that didn't get it.

N-acetylcysteine upregulates thermogenic genes (UCP3, PGC1α) in adipose tissue, increasing mitochondrial activity and energy expenditure, while reducing hyperinsulinemia and improving glucose clearance.

Mice that got the supplement had less fat buildup in their brown fat compared to mice that didn't get it.

Mice that got the supplement had higher levels of a hormone that helps regulate metabolism in their fat tissue.

The fat cells in mice that got the supplement were about 30% smaller than in mice that didn't get it.

Mice that got the supplement had about half as much body fat as mice that didn't get it, even when both groups ate the same high-fat diet.