Gut loading is the practice of feeding nutritious foods to feeder insects so those nutrients pass on to your reptile when it eats them. Insects like crickets, dubia roaches, and black soldier fly larvae are essentially nutrient delivery vehicles, and what they eat in the 24 to 48 hours before being offered matters significantly.

Start by housing your feeder insects in a clean, ventilated container with egg crate or cardboard tubes for climbing surface. Remove any dead insects daily to prevent mold and bacterial growth.

Offer a variety of fresh vegetables and fruits as gut load. Dark leafy greens such as collard greens, mustard greens, turnip greens, and dandelion greens are excellent staples due to their high calcium content. Squash, sweet potato, and carrots provide carotenoids and additional vitamins. Small amounts of apple, mango, or papaya add moisture and palatability.

Avoid feeding insects anything high in oxalates such as spinach or rhubarb, as oxalates bind calcium and reduce its availability. Also avoid iceberg lettuce, which has almost no nutritional value, and any food treated with pesticides.

Commercial gut load products are available and offer convenience. Dry formulas from reputable reptile supply brands are formulated with appropriate calcium-to-phosphorus ratios, usually targeting at least a two-to-one calcium-to-phosphorus ratio.

Timing is key. Offer the gut load at least 12 to 24 hours before feeding the insects to your reptile. This allows the insects to fill their digestive tracts with the nutritious food. Insects fed immediately before offering have not had time to process the gut load.

Dusting with calcium powder right before feeding complements gut loading but does not replace it. Gut loading provides a broader spectrum of vitamins and minerals that surface dusting alone cannot deliver.