"Leopard gecko health — hypovitaminosis A in insectivorous lizards; beta-carotene not metabolized"
Source: Merck Veterinary Manual (merckvetmanual.com), a copyrighted professional veterinary reference. Per COPYRIGHT_POLICY §3, the points below are paraphrased derived fact summaries: numerical values and proper nouns are preserved from the source, but sentences are rewritten and not quoted verbatim.
Claims
*[Paraphrased derived summary — non-Open-Access source.]* Hypovitaminosis A is common in aquatic turtles and insect-eating lizards fed diets low in preformed vitamin A; the common beta-carotene supplement cannot be converted to vitamin A by many reptiles.