This product is carb-free, and is a green tea extract only supplement.
Yes, Green tea leaf extract is a metabolism boosting extract, it is primarily a natural weight management extract and doesn't increase muscle breakdown. Preventing muscle breakdown is primarily going to come from the right protein, diet & carb intake.
Green Tea Extract 1500 has a minimal amount of caffeine, at maximum it is 14.7mg of caffeine per vegetarian capsule. Typically, there will be less than that milligram amount per vegetarian capsule.
"I have slowly lost 20 pounds over 3 months. However, I want my weight loss to be slow so I don't have sagging skin. I have noticed my belly fat has decreased." - Mary P. Amazon Customer