The manufacturing procedure for sodium ascorbate involves dissolving ascorbic acid in solution with sodium bicarbonate (prepared from sea water). This process removes the bicarbonate from the sodium replacing it with ascorbic acid forming sodium ascorbate. This process produces a truly buffered vitamin C. Each teaspoon = 4,725 mg Vitamin C.
I cant find the larger study I read recently on this but basically sodium ascorbic is ascorbic acid and sodium bicarbonate!
So you are saying sodium ascorbate is not just buffered ascorbate acid but becomes a totsally fifferent substance though this simple solution! I understand that but it is still is ascorbic acid from the start. My point being is you only have to add sodium bicarbonate and ascorbic acid in a glass of water and you have sodium ascorbate , which you can do yuorself with these two substances! Sodium ascorbate is expensive compared to ascorbic acid and baking soda. Make your own!
You probably could make it that way, except I don't know off top of my head what other substances there would be (CO2 most likely), and above all, sodium ascorbate is used for IVs or as drops for sinus problems and the stuff you'd make at home would not be pure enough for that type of use. I'd stick with commercial grade.
if it's too expensive in the UK, have you checked prices in the US? I use calcium ascorbate so I wouldn't know.