Biocare vitamin c powder 250g vitamin c powder contains magnesium ascorbate which is a low acid form of vitamin c produced by our unique solvent free freeze dried method it is free from additives and excipients this form of vitamin c is more gentle on the stomach provides a readily absorbable form of vitamin c and magnesium buffered low acid form of vitamin c to reduce stomach irritation magnesium ascorbate does not leach minerals such as calcium and potassium from the body suitable fo