You can get sodium ascorbate from iherb, sometimes Vitacost, and Amazon. I am really mega dosing currently - I drink the whole 1 1/2 cup daily, sipping on it some every hour from morning until about 7 PM. It has helped me so much to overcome an "adrenal crash", plus cancer has been in my family, I know it can be latent in the body, I hear this can wipe it out and I want to kill any & all I can. Other people just take 1 tbsp a day. It depends on your preference.