This study was done to investigate the effects of common food additives such as sodium benzoate (SB) and ascorbic acid (AA) on haematological parameters of male Wistar rats. Forty-eight (48) male albino rats with an average weight of 105 g were grouped into twelve (n = 4) of Basal Control and other 11 groups orally administered 1 mg of SB, 10 mg of SB, 10 mg of AA, 0.2 mg of AA + 0.5 mg of SB, 0.2 mg of AA + 1 mg of SB, 0.2 mg of AA + 10 mg of SB, 0.2 mg of SB + 0.1 mg of AA, 0.2 mg of SB + 0.5 mg of AA, carbonated soft drinks (CSD)+ 0.1 mg of AA, CSD + 1 mg of AA and CSD + 10 mg of AA, respectively for 21 non-consecutive days. At the end of the experiment, blood samples were collected in EDTA anticoagulant tubes, haematological parameters were evaluated, and data were analyzed. There was a dose-dependent increase (p < 0.05) in White Blood Cell counts of SB treated rats compared with the control group. The lymphocyte exhibited significant reduction (p < 0.05) in the groups treated with 1mg SB and 10mg SB/kg bodyweight of 67 ± 2.96 and 58 ± 4.18%, respectively. The mean corpuscular haemoglobin showed no significant difference at 95% confidence interval. However, mean corpuscular haemoglobin concentration, haematocrit and platelet were affected by an increase in the concentrations of SB. High SB concentrations increased the destruction of erythrocytes, which directly increased the catabolism of haemoglobin. However, AA administration mitigated the adverse effects of SB on the haematological parameters of the animal.