Depends on their total diet. If you’re feeding a well balanced diet with a lot of good weeds and they live outdoors they shouldn’t need it. I will supplement my adults in the winter when they are indoors and the food is limited. They’re eating mostly a variety of produce, Mazuri, and dried grasses in the cold months so i might supplement every other week. But in summer when they’re outdoors they never get it. For hatchlings it’s different. I will supplement maybe twice a week for the first two months. After that they usually go outside so I don’t worry about it. If they are indoors, with a limited diet and they’re in a growth phase I supplement. I also supplement if they are indoors and gravid. In all cases though it’s maybe once or twice a week. Never daily. Best thing to do, in my experience, is to keep them outdoors as much as possible and feed them a wide variety of foods and as much natural weeds and grasses as possible. In that case you’ll never need to supplement.
I have never kept Egyptian but would assume if you fed it the right foods and made sure you give it a good variety it’s better than supplementing on a regular basis. There’s no substitute for keeping a tortoise outdoors when the weather is favorable. I know some have had great success keeping them outdoors even for a more sensitive species like that. Having said that supplementing once in a while is not a bad thing. But I would defer to others who have more experience with that species.It's for my Kleinmanns and they go indoors. I mean they are about 3 years old
I have never kept Egyptian but would assume if you fed it the right foods and made sure you give it a good variety it’s better than supplementing on a regular basis. There’s no substitute for keeping a tortoise outdoors when the weather is favorable. I know some have had great success keeping them outdoors even for a more sensitive species like that. Having said that supplementing once in a while is not a bad thing. But I would defer to others who have more experience with that species.