Which of the following harmful products is not produced in the biochemical reactions of the cells of living organisms?

The correct option is D Lymph
Lymph is the tissue fluid that circulates in lymphatic vessels. It is similar to blood but without red blood cells. It is not a metabolic harmful product.

While ammonia, urea and uric acid are waste products that are produced due to the degradation of nitrogenous products.

Thus, the correct answer is option D.