A trial was carried out to study the possibility of using garlic paste as feed additive to high nutrients density broilers diets. Four hundred eighty one day-old male chicks of commerical meat line were used in the trial. The birds were distributed into four groups of 120 birds each and fed with isocaloric and isonitrogenous diets, containing different levels of tested garlic as follows: 0 %, 1%, 2%, 3%. The experiment lasted for 6 weeks. Live body weight and feed conversion ratios were weekly recorded. Estimate of serum biochemical parameters. Results showed as follows: There is a positive effect of adding garlic paste on the growth rate which significantly increased (P<0.05) and (P<0.01) when it was added to diets containing 3%. It was also found a positive effect of adding  garlic paste to diets on feed conversion ratio specially with 3% rate. There is significant increase (P<0.05)in total protein when garlic paste was added to diets in 3% and 2% rate at 21 and 42 days. There is significant increase (P<0.05) in Albumin when garlic paste was added to diets in 3% rate at 21 and 42 days. There is significant decrease (P<0.05) in serum cholesterol and glucose levels when garlic paste was added to diets in 3% and 2% rate at 21 and 42days. There is significant decrease (P<0.05) in serum triglycerides levels and LDL when garlic paste was added to diets in 3% rate at 21 and 42 days.