D3 adjustment if using UVB: How Leopard Geckos Use It
Frequency
Reduce D3 supplementation accordingly
Role
Leopard geckos are crepuscular and get limited UV exposure naturally, but captive geckos with proper UVB lighting (5–7% UVB, 10–12 hours/day) will synthesise D3 through their skin. If running UVB, cut back on D3 in dusting powder to avoid overdose. Consult your vet for exact reduction amounts based on UVB output.
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Calcium powder with D3 is used every feeding (juveniles) / every other feeding (adults). Primary defence against Metabolic Bone Disease.
Plain calcium (no D3) is used always available in a small open dish. Many geckos self-regulate calcium intake by licking a small dish voluntarily.
Multivitamin powder is used once per week maximum. Provides vitamins A, B complex, and E that are not present in sufficient quantities in feeder insects even with gut-loading.