الفهرس 
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Abstract
This study was carried out using different levels of vitamin C and pepper seeds as the natural source which are commonly used in Egypt. * The study was carried out as follows: Rats were divided into 11 groups 6 rats in each group and fed several diets for 28 days as follows: - G 1: Control group - G 2: Rats fed on 100mg vit.C - G3: Rats fed on 200mg vit.C - G4: Rats fed on 400mg vit.C - G5: Rats fed on 800mg vit.C - G6: Rats fed on 1600mg vit.C - G 7: Rats fed on pepper seeds as 100mg vit.C - G8: Rats fed on pepper seeds as 200mg vit.C - G9: Rats fed on pepper seeds as 400mg vit.C - G10: Rats fed on pepper seeds as 800mg vit.C - G11: Rats fed on pepper seeds as 1600mg vit.C After 4 weeks the effect of the different experimental diets on body weight gain, food intake, feed efficiency ratio, organs relative weight, glucose, glycoylated , liver function, kidney function, and blood lipid profile were determined. The results of the present study can be summarized in case the vitamin C and pepper seeds as follows: 1. Food intake for groups 1, 2, 3, 4and 5 were decreased when compared with control group in case the vitamin C and pepper seeds 2. Our results revealed that the feed efficiency ratio increased gradually in all groups compared to control except at high levels 1600 mg vitamin C and its source. 3. Body weight gain decreased gradually for groups 1, 2, 3, 4, 5 and 6 compared to control. 4. Our results revealed that therewas non-significant differences between all relative organ weights of pancreas compared to control while liver, and kidney at high levels , there were significant differences compared to control 5. Blood glucose, there is no significant difference between control, groups 2 and 3. However groups 4 and 5 were decreased than the control and this decrease was statically significant. 6. Glycolated Hb in group 6 showed a higher significant difference in relation to the other groups. There is no significant difference between control and groups (2, 3,4 and5). 7. Our results for liver functions indicate that feeding rats on different levels of vitamin C showed increased compared to control except group 6 but this increase or decrease in the range reported for normal rats. 8. Our results revealed that, creatinine showed no statistical difference between these groups and control group except group 6 showed a higher values than the other groups. 9. The concentration of albumin, All groups 2, 3, 4, 5 and 6 values showed no statistical difference compared to control group< 10. Groups (2) to (6) showed more values than result of the control group but there is no statistical difference between these groups and control group for uric acid. 11. there is no significant difference between control and group (2,3,4 and 5). Group 6 showed a higher value than control for total cholesterol . 12. Th e is no significant difference between control and all groups (2), (3), (4) and (5) but group(6) was significantly decreased than the others for HDL and LDL.