I got this from the Drs. Foster & Smith website.
Vita-Chem Frequently Asked Questions
Q. Can I use the freshwater formula in my saltwater aquarium and vice versa?
A. Yes. You can use either formula without any harm. However, for optimum benefits, you should use the appropriate formula for your particular aquarium.
Vita-Chem Marine
Ingredients:
Ascorbic acid, marine algae (ulva and kelp), marine sponges (Cliona cliona), marine plankton extract, biotin, soluble brewer's yeast, cobalamine concentrate, L-Lysine HCL, d-alpha tocopherol, inositol folic acid, hydrochloride monohydrate.
Vita-Chem Freshwater
Ingredients:
Ascorbic acid, marine algae (ulva and kelp), plankton extract, biotin, soluble brewer's yeast, cobalamine concentrate, L-Lysine HCL, d-alpha tocopherol, inositol folic acid, hydrochloride monohydrate.