Vitamins and gut load

I read today that for adult leopard gecko you should use a calcium vitamin twice a month. and a regular reptile vitamin once a month. Is this true? Also to gut load every time you feed crickets. I think I read that before. If anyone can tell me how they do the vitamin and gut load thing and what are the best products to use. I would greatly apperciate it. I also have plain calcium in my geckos tank to.

Hi, this is what I do. I dust every meal with calcium. One day in the week, I dust with vitamins. Also I always gutload the Crickets or the Dubia with carrots and vegetables.

Yes, for an adult you are right...calcium w/D3 and vitamins each a few times a month is plenty. I also dust with pure calcium at least once a week, even though there is some in the tank at all times.
I just listed what I use for gutload in your other post :)
Carrots and veggies are great for moisture but aren't really a good gutload.

What is the best food to gutload with?