Are there safe alternative therapies for gelatin allergy?

Gluten? Gluten allergy is far more common than gelatin allergy. It produces celiac sprue -- if perhaps you meant "gluten", then the remedy is the most natural of all -- a closely managed diet. If i guessed wrong, then please forgive me. Good luck.
Avoidance. Gelatin is present in many food stuffs and medications. You need to determine first if you have allergy to gelatin as prevention of exposure to gelatin may be difficult.