The primary product of the Krebs cycle in cellular respiration is ATP (adenosine triphosphate) along with NADH and FADH2. This cycle occurs in the mitochondria and plays a crucial role in producing energy from carbohydrates, fats, and proteins. Each turn of the cycle processes acetyl-CoA derived from these macronutrients, releasing carbon dioxide as a byproduct while generating high-energy electron carriers that feed into the electron transport chain for further ATP production.