How to put weight on skinny leo?

Hello. I have an underweight leopard gecko on my hands. I think it's a male, I named him Levi. He's about a year old. I just recently got him from a friend and he needs some weight put on for sure. What's the best feeding plan for him? I was thinking about feeding a variety of gut-loaded things with some calcium supplements but I was wondering what specifically I could do or feed to get him healthier. Please let me know if you have any questions, I'll answer best I can, I just want him to feel better.

Give him a waxworm or a pinkie. A vionate supplement can also be used as prescribed. If he is eating normally then an increased intake or wormy feeders should be suffice to raise his weight up

Before getting drastic, I'd recommend just feeding him a variety of dusted feeders and see how he does. Waxworms are quite fatty and there's always a chance he'll refuse anything else. Pinkies are a pretty substantial size and may be more than he can handle if he's been undernourished for a long time.

Aliza