I just read online that some gelatins contain phosphate additives and may not be recommended, especially if phosphorus control is an issue. Check labels and ingredients. Unflavored gelatin makes a good substitute. (kidney disease; diabetic condition)
...Good luck on your journey
Ingredients: sugar free jello
Ingredients: Gelatin, Adipic Acid (for Tartness), Disodium Phosphate (controls Acidity), Maltodextrin (from Corn), Fumaric Acid (for Tartness), Aspartame (Sweetener), contains less than 2% of Artificial Flavor, Acesulfame Potassium (Sweetener), Salt, Red 40.