Beet juice is very powerful so you require just a little dosage to get the benefits. You can increase the amount from half a glass to 1 glass gradually. Fresh tubers contain small amounts of vitamin C; however, its top greens are rather excellent sources of this vitamin. 100 g of beet greens provide 30 mg or 50% of RDA. Vitamin C is one of the powerful natural antioxidants, which helps the human body scavenge deleterious free radicals one of the reasons for cancer development.