Dust your bearded dragon’s insects with a phosphorus-free calcium powder at most feeds, add a calcium with vitamin D3 or a multivitamin a few times a week, and give proper UVB light. Insects carry far more phosphorus than calcium, so without supplements a dragon can develop metabolic bone disease. Pick one schedule and stick to it, because doubling up on D3 or vitamin A can cause toxicity.
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Calcium and supplement types compared
| Supplement | What it does | How often | Watch out for |
|---|---|---|---|
| Calcium without D3 | Balances the high phosphorus in insects | Most feeds | Choose a phosphorus-free powder |
| Calcium with D3 | Adds D3, which a dragon needs to use calcium | 2–3 times a week (VCA) | D3 is fat-soluble and builds up if overdosed |
| Multivitamin | Vitamins and trace minerals that insects and greens can lack | Once or twice a week | Vitamin A content: preformed A or beta carotene (see below) |
| All-in-one calcium plus vitamins | Calcium, D3 and vitamins in one powder | Per the label | Do not combine with a separate D3 or multivitamin unless the label says so |
Calcium and D3 work together with UVB light. A dragon makes its own D3 in its skin under UVB, and Washington State University’s vet hospital notes that without proper UVB lighting a dragon cannot absorb calcium effectively (WSU). Supplements do not replace a good UVB light.
The supplements we would buy
- Calcium without D3: Zoo Med Repti Calcium without D3. Phosphorus-free calcium for routine dusting.
- Calcium with D3: Zoo Med Repti Calcium with D3. For the 2–3 dustings a week on VCA’s schedule.
- Multivitamin: Rep-Cal Herptivite. A reptile multivitamin to rotate in once or twice a week. Check the label for its vitamin A source.
- All-in-one: Repashy Calcium Plus. Calcium, D3 and vitamins in one powder, if you would rather not juggle three tubs. Use it on its own, not alongside the others.
Calcium schedules from the main care sources
The sources agree on the basics and differ on the details. Each schedule below is complete on its own, so follow one rather than mixing them.
| Source | Calcium without D3 | D3 | Multivitamin |
|---|---|---|---|
| VCA Animal Hospitals | A light dusting on food daily | Calcium with D3, 2–3 times a week | Not specified |
| ReptiFiles | All insects and salads, at every age | From the multivitamin | On salads twice a week for babies, juveniles and gravid females; once a week for adults |
| Zen Habitats | Most meals, with an occasional day off | Calcium with D3 every couple of meals | About once a week |
Young dragons need more calcium than adults; Dr. Wissman notes that adults still need calcium, but not as much as growing babies and juveniles. Babies and juveniles eat insects every day, so they get dusted food every day; adults eat insects only a couple of times a week. Our food guide has the full feeding schedule by age.
How to dust insects
- Gut-load first. Feed the insects a calcium-rich gut-load for at least 24 hours before they go to your dragon. Our dubia roach guide covers why this matters.
- Shake and bake. Put the insects in a bag or tub with a pinch of powder and shake gently.
- Keep it light. Zen Habitats says to aim for a thin layer, not a thick coat.
- Feed straight away. Zen Habitats says to dust just before feeding.
- Sprinkle salads too. ReptiFiles dusts salads as well as insects.
Vitamin A: preformed or beta carotene?
This is the one point where the sources disagree. Zen Habitats says multivitamins should contain preformed vitamin A, because most reptiles cannot convert their own. Dr. Margaret Wissman, a board-certified veterinarian (DABVP) writing in Reptiles Magazine, says bearded dragons seem particularly sensitive to vitamin A toxicity and that beta carotene is safer because the body converts it only as needed. Ask your reptile vet which they prefer, and whichever you choose, do not stack two products that both contain preformed vitamin A.
Signs of calcium deficiency (metabolic bone disease)
WSU lists these signs of metabolic bone disease. Juveniles are particularly vulnerable.
- Weakness or difficulty walking
- A swollen or soft jaw (“rubber jaw”)
- Limb deformities or fractures
- Muscle tremors
- Lethargy and loss of appetite
- Seizures, in advanced cases
Any of these needs a vet visit. Treatment is calcium and D3 under a vet’s direction plus fixing the lighting, heat and diet. See our care guide for the full setup and the heat lamp guide for temperatures, since a dragon also needs warmth to digest and absorb calcium.
Common mistakes
- Relying on supplements instead of UVB. Powders do not replace a proper UVB tube.
- Using D3 at every feed. D3 builds up in the body. Follow one schedule.
- Stacking products. An all-in-one plus a separate multivitamin doubles the vitamins.
- Using a calcium with phosphorus. Insects already have plenty of phosphorus. Pick a phosphorus-free calcium.
FAQ
How often should I give my bearded dragon calcium?
Dust insects with a phosphorus-free calcium at most feeds. VCA recommends a light dusting on food daily, with calcium plus D3 two to three times a week.
Should I use calcium with or without D3?
Both, on a schedule. Use calcium without D3 for routine dusting and calcium with D3 two to three times a week, or follow a schedule where the D3 comes from a multivitamin instead.
Do bearded dragons need calcium if they have UVB?
Yes. UVB lets a dragon make vitamin D3, but insects are still low in calcium compared with phosphorus, so dusting is still needed.
Can you give a bearded dragon too much calcium?
Over-supplementing is a risk, especially with D3 and vitamin A. Zen Habitats notes that these fat-soluble vitamins build up in the body. Stick to one schedule and do not combine all-in-one products with separate vitamins.
What are the signs of calcium deficiency in a bearded dragon?
Weakness, trouble walking, a soft or swollen jaw, tremors, limb deformities and fractures are signs of metabolic bone disease. See a reptile vet.
Do I need to dust vegetables with calcium?
ReptiFiles dusts salads as well as insects. A light sprinkle on the salad is enough.
Sources
- VCA Animal Hospitals: feeding bearded dragons
- ReptiFiles: bearded dragon food and feeding
- Zen Habitats: bearded dragon supplementation guide
- Margaret A. Wissman, DVM, DABVP: bearded dragon supplements (Reptiles Magazine)
- Washington State University Veterinary Teaching Hospital: metabolic bone disease in bearded dragons
More guides: food and diet, dubia roaches, UVB light, care.