You are buying a large amount of a high quality product from a wholesaler. It is Vitamin C without the sourness. 1 Kg means that if you use the megadose of 1000 mg each day, this supply would last you 3 years, costing you only about 2 cents/day. Linus Pauling, one of the few people in human history who won more than one Nobel Prize, was a big advocate of this.

From Wikipedia:

Sodium ascorbate is one of a number of mineral salts of ascorbic acid (vitamin C). The molecular formula of this chemical compound is C6H7NaO6. As the sodium salt of ascorbic acid, it is known as a mineral ascorbate. It has not been demonstrated to be more bioavailable than any other form of vitamin C supplement.

As a food additive, it has the E number E301 and is used as an antioxidant and an acidity regulator. It is approved for use as a food additive in the EU, USA, Australia, and New Zealand.

In in vitro studies, sodium ascorbate has been found to produce cytotoxic effects in various malignant cell lines, which include melanoma cells that are particularly susceptible.

As our way to offer you a quantity discount, additional bags are shipped free. We are a reputable Massachusetts corporation with over 30 years of experience. We sell quality products at the best prices you can find anywhere. You are paying wholesale prices because you are buying direct.