The Foundation of Reptile Bone Health
Metabolic bone disease (MBD) is the most common preventable health issue in captive reptiles. It develops slowly — over months of slightly-imbalanced calcium intake — and presents as soft bones, deformed jaws, and eventually fractures and death. The single biggest dietary factor in MBD prevention is feeding foods with favorable calcium-to-phosphorus ratios. This page lists every food in our database with a Ca:P ratio of 2:1 or higher.
A 2:1 ratio means the food provides twice as much calcium as phosphorus. This matters because phosphorus binds calcium during digestion, preventing absorption. When the ratio is inverted (more phosphorus than calcium), the reptile actually loses calcium during the meal. Even a 1:1 ratio is barely break-even. Only ratios at 2:1 and above reliably deliver net positive calcium to the body.
For herbivorous and omnivorous reptiles — bearded dragons, iguanas, blue tongue skinks, tortoises, uromastyx — the diet should be built on foods from this list. Staples like collard greens, dandelion greens, mulberry leaf, and hibiscus offer 3:1 or better ratios. Even foods at the 2:1 floor are acceptable when balanced with calcium supplementation. Foods below 2:1 should appear in rotation for variety, not as the bulk of the diet.
For insectivores and carnivores, calcium supplementation does the heavy lifting since insects and prey items naturally have low Ca:P ratios. Gut-loading feeder insects with calcium-rich foods from this list — collards, dandelion, mulberry leaf — significantly improves the insects' calcium delivery before they're offered to your reptile.