Bitter almond is a peach fruit from the Rosaceae family.  Despite its diverse health benefits, some harmful and toxic properties can be produced in the body as it contains hydrocyanic acid, which gives a bitter taste. This study was conducted to investigate the harmful toxic properties of bitter almonds that can be produced in the body as they contain hydrocyanic acid; despite its many beneficial secondary metabolites. Methods: Whole bitter almond seeds collected in Iraq were extracted and dosed to rats. 20 Westar albino male rats weighing (200- 250) gm were obtained from the Biotechnology Center / AL-Nahrain University. The animals were divided into 4 groups (control group administered distill water orally only, T1 = first tested group administrated 100 mg /kg body weight, T 2 = second treated group administrated 200 mg / kg B.W. and T 3 = third treated group administrated 300 mg / kg B.W. All groups were treated by oral route every day for four weeks. Then, samples were collected for histological study of the organs of the liver and kidneys. Results: There was a significant (P≤ 0.05) rise for ALT, AST, ALP, LDH, urea, creatinine, uric acid, cholesterol, triglyceride and a significant (P ≤ 0.05) increase in LDL for both T2 and T3 in comparison with T1 plus control group. The total serum bilirubin explained no significant (P ≤ 0.05) difference between treated groups with the control. The HDL cleared a significant (P ≤ 0.05) decrease in T3 with comparison with the control group, T1 and T2. After examining tissue sections with a compound microscope, it was found that various changes occurred, such as; bleeding, cell necrosis, congestion and damage to blood vessels in both organs.