The present invention relates to a method for obtaining a propyl propane thiosulfonate (PTSO) product for modulating the immune response in healthy or sick individuals. The method includes selecting a compound based on PTSO for incorporating it into a PTSO product. The compound based on PTSO contains PTSO the formula of which is R-SOa-S-R, where "R" represents the n-propyl (-CH2-CH2-CH3) group and "a" is 2. The compound based on PTSO is then incorporated into a PTSO product.