Preventing MBD in veiled chameleons

Reptile welfare is almost entirely determined by getting the environment right — temperature gradient, UV lighting, humidity, and substrate all need to match the specific species' natural habitat. Get any of those wrong and you're not looking at a one-off problem, you're looking at chronic stress and illness that compounds over time. So before anything else: what species are you keeping, how old is the animal, and what are you setting up or trying to improve right now?

Good instinct — MBD is sadly very common in veiled chameleons, and it's almost always preventable with the right supplementation routine from the beginning. Before I point you to the right product, I need to know a couple of things: what UVB bulb are you running, and are you dusting live feeders or using a different method? The answers change the calcium-to-D3 ratio you need.

That's a solid setup — the Arcadia 6% T5 is exactly the right choice for a veiled chameleon and it produces meaningful D3 when the animal basks correctly within range. Because you have strong UVB, you don't want to over-supplement D3 or you risk toxicity, which is just as harmful as deficiency. The protocol that works well here is: plain calcium without D3 at most feedings, and a combined calcium-with-D3 plus multivitamin supplement twice a week at most. The product I'd recommend is Repashy Calcium Plus LoD — it's specifically formulated for species with good UVB access, giving you a lower D3 load alongside vitamins including A, E and B complex. Use it twice a week on your feeders, and use a plain calcium carbonate powder like Komodo Calcium on the other feeding days. That combination covers everything without tipping into D3 excess.

It's available on Amazon UK and from most specialist reptile retailers. Once opened, store it in a cool, dry place with the lid sealed tightly — it'll keep well for around a year. One practical tip: dust feeders lightly, not heavily. You want a fine visible coating on the insect, not a thick white crust. Over-dusting is one of the most common mistakes and chameleons will start refusing feeders that taste too chalky. Light and consistent beats heavy and occasional every time.

Yes — make sure your chameleon can actually get within 25–35cm of that UVB tube during basking. Mesh does reduce UV transmission slightly, so proximity matters more than it would with glass. Also ensure he has a thermal gradient with a basking spot around 32–34°C so he can thermoregulate properly; D3 synthesis and calcium metabolism both depend on the animal being able to reach operating temperature. Hydration matters too — chameleons that are chronically underhydrated absorb nutrients poorly. If you're misting twice daily and seeing him drink regularly, you're in good shape. You've got the fundamentals right; the Repashy LoD routine will cover the rest.