Best Leopard Gecko Supplements (2026)

Metabolic bone disease is the most common serious illness in captive leopard geckos — and the most preventable. Behind almost every MBD diagnosis is the same chain of failures: insufficient calcium, absent or inadequate D3, and a multivitamin schedule that never quite happened.

The good news is that the correct supplementation protocol is straightforward once you understand the two variables that determine your schedule: does your gecko have UVB lighting, and what is the primary feeder insect?

We researched keeper reports, breeder recommendations, and veterinary sources to identify the 6 best leopard gecko supplements — covering calcium with D3, pure calcium for the free-feeding dish, multivitamins, and the all-in-one option for keepers who want maximum simplicity.

Quick Comparison Table

Detailed Reviews

Repashy Calcium Plus — Best Overall

Repashy Calcium Plus is the supplement that experienced breeders reach for when they want one jar that handles everything. Calcium carbonate, vitamin D3, preformed vitamin A (retinol), and a full spectrum of vitamins and minerals — all in a single product. Dust insects at every feeding and the supplementation protocol is complete: no separate multivitamin schedule, no alternating-day tracking.

The fine powder adheres cleanly to crickets, dubia roaches, and mealworms without excessive clumping. For breeding females, the all-in-one profile is especially practical — elevated supplementation demands during egg production are covered without introducing extra complexity.

Critical rule: Do not combine Repashy Calcium Plus with any other D3 or vitamin A supplement. The comprehensive formula is calibrated as a standalone product. Stacking additional D3 or preformed retinol pushes both nutrients beyond safe levels for leopard geckos.

Pros: Complete nutrition from one jar; industry-trusted formula; fine powder adhesion

Cons: No flexibility to adjust individual nutrients; must not be combined with anything else

Pro Tip: If you open a new jar of Repashy Calcium Plus, write the date on the lid. Supplements lose potency within 12 months of opening — especially D3 and vitamins that degrade with air exposure. Discard any opened jar after one year regardless of how much remains.

Zoo Med Repti Calcium with D3 — Best Calcium + D3

Zoo Med Repti Calcium with D3 is the baseline recommendation for every leopard gecko kept without UVB lighting. Pharmaceutical-grade calcium carbonate with optimized D3 — phosphorus-free to avoid compounding the Ca:P imbalance already present in feeder insects like crickets (which run approximately 1:3 to 1:9 calcium-to-phosphorus).

The 8oz jar offers strong per-ounce value for a supplement used at most feedings. Stocked at every PetSmart, Petco, and Chewy, which matters when you run out unexpectedly.

Important limitation: This product provides calcium and D3 only. For a complete supplementation protocol, pair it with a separate multivitamin (Zoo Med ReptiVite with D3 or Repashy Calcium Plus) dosed once per week. See the schedule table below for exact timing.

Pros: Pharmaceutical-grade, widely available, excellent per-ounce value at 8oz, strong track record

Cons: Does not include vitamin A or multivitamin coverage; must not be used alongside UVB

Zoo Med Repti Calcium without D3 — Best for Calcium Dish

Zoo Med Repti Calcium without D3 fills a specific and essential role in every leopard gecko enclosure: the free-feeding calcium dish.

Leopard geckos self-regulate calcium intake by licking from a shallow dish of plain calcium powder available at all times. This behavior is well-documented and serves as a passive supplementation backup alongside the active dusting schedule. According to ReptiFiles' reptile nutrition guide, the calcium dish is a recommended standard in modern leopard gecko care.

Why no D3 in the dish? D3 is fat-soluble — unlike water-soluble vitamins, excess D3 accumulates in fat tissue rather than being excreted. Unlimited access to a D3-containing powder creates real overdose risk over weeks and months. Pure calcium is self-limiting: the gecko takes what it needs and stops. Always use D3-free calcium in the dish.

This product is also the correct dusting calcium for geckos with UVB lighting, where UVB already provides the D3 synthesis pathway.

Pros: Safe for unlimited dish access, correct for UVB setups, phosphorus-free

Cons: Not a standalone dusting supplement without a separate D3 source; can clump in humid enclosures

Pro Tip: Place the calcium dish on the warm side of the enclosure (85–90°F surface temperature) near your gecko's primary activity zone. Geckos visit the dish most frequently during active periods — positioning it near the warm hide or feeding station maximizes use.

Rep-Cal Calcium with D3 Ultrafine — Best Dusting Texture

If you've noticed calcium powder falling off crickets before your gecko can catch them, Rep-Cal Calcium with D3 Ultrafine solves that problem. Formulated from oyster shell calcium carbonate and ground to a noticeably finer particle size than competing products, the ultrafine grind creates better adhesion to the textured exoskeletons of dubia roaches and crickets.

For juvenile leopard geckos or breeding females — where every milligram of calcium per feeding matters — the adhesion advantage is meaningful. Less waste per dusting means more reliable calcium delivery across the week.

The phosphorus-free calcium carbonate formula is clean and consistent. Rep-Cal has been manufacturing reptile supplements for decades, and this product reflects that track record.

Pros: Ultrafine powder with superior adhesion; oyster shell calcium source; phosphorus-free; decades-long track record

Cons: Smaller 3.3oz jar; fine powder creates dust clouds when opening; less stocked locally than Zoo Med

Zoo Med ReptiVite with D3 — Best Multivitamin

Zoo Med ReptiVite with D3 is the multivitamin for keepers running a two-product supplementation protocol: dedicated calcium powder at most feedings, complete multivitamin once per week.

What makes ReptiVite stand out among multivitamins is the 2:1 calcium-to-phosphorus ratio built into the formula. Most multivitamins contribute phosphorus that further worsens the feeder insect Ca:P imbalance. ReptiVite's 2:1 Ca:P means the multivitamin day actually contributes to calcium balance rather than disrupting it. The amino acid profile adds protein metabolism support that pure calcium supplements cannot offer.

The large 8oz jar provides excellent long-term value for once-weekly use — a single jar typically lasts 12 months or more for a single-gecko keeper.

Pros: 2:1 Ca:P ratio helps rather than hurts calcium balance; amino acids; D3 included; excellent value per ounce

Cons: Contains D3 — avoid combining with D3 calcium supplement on the same day; still requires dedicated calcium as the primary supplement

Fluker's Repta Vitamin with Beta Carotene — Budget Multivitamin

Fluker's Repta Vitamin with Beta Carotene uses beta-carotene as its vitamin A source rather than preformed retinol. For species that convert beta-carotene efficiently, this reduces overdose risk. Leopard geckos are insectivores that may convert beta-carotene to retinol less efficiently than herbivores — so keepers who want guaranteed vitamin A delivery should consider Repashy Calcium Plus (which uses preformed retinol) instead.

That said, Fluker's Repta Vitamin performs its B-complex vitamin role reliably. For once-weekly supplementation in an otherwise complete protocol, it functions adequately at a lower cost.

The 1.5oz jar is a practical advantage for solo-gecko keepers: smaller volume means less potency loss from oxidation before you finish the jar, which is particularly relevant for vitamin supplements that degrade within 12 months of opening.

Pros: Beta-carotene reduces vitamin A overdose risk; B-complex coverage; smaller jar stays fresher for single-gecko keepers

Cons: Beta-carotene may be poorly converted in insectivores; higher cost per ounce than ReptiVite; no calcium

MBD Prevention: The Science Behind Supplementation

Metabolic bone disease — formally Nutritional Secondary Hyperparathyroidism — is what happens when calcium absorption fails over weeks or months. According to the Merck Veterinary Manual, it is the most common bone disease diagnosed in captive reptiles.

Three failure points cause it:

1. Insufficient dietary calcium — feeder insects alone do not provide adequate calcium. Crickets, mealworms, and dubia roaches have calcium-to-phosphorus ratios of roughly 1:3 to 1:9. Dusting corrects this imbalance.
2. D3 deficiency — without vitamin D3, dietary calcium cannot be absorbed through the intestinal wall regardless of how much is provided. D3 comes from either UVB synthesis or supplementation.
3. Inverted Ca:P ratio — excess dietary phosphorus actively blocks calcium absorption by binding to free calcium before it reaches the bloodstream.

Preventing MBD requires correcting all three simultaneously. Calcium without D3 accomplishes nothing. D3 without calcium has nothing to absorb. Calcium and D3 together can still be blocked by excess phosphorus from un-dusted insects.

Highest-risk animals:

• Juvenile geckos (0–12 months) during peak bone development
• Breeding and gravid females with elevated calcium demand from egg production
• Geckos fed primarily mealworms, which have the worst Ca:P ratios among common feeders

Early MBD warning signs (from PetMD's MBD in reptiles guide):

• Rubbery or soft lower jaw — often the earliest physical sign
• Tremors or twitching in the legs, toes, or tail
• Lethargy and reduced hunting activity
• Kinked spine or tail deformities
• Difficulty gripping or climbing

Early-stage MBD is reversible with corrected supplementation and veterinary care. Advanced MBD with permanent bone deformities requires exotic vet management and carries a guarded prognosis. For leopard gecko care foundations, see our species profile and diet guide.

Supplementation Schedule: With and Without UVB Lighting

Your supplement schedule depends on one variable: whether your leopard gecko has access to UVB lighting.

D3 is fat-soluble. Unlike water-soluble B vitamins, excess D3 accumulates in body fat and can reach toxic concentrations if both UVB and supplemental D3 are combined. Soft tissue calcification, lethargy, and loss of appetite are the signs of D3 toxicity. Choose one D3 source and commit to it.

For UVB setup and lamp recommendations, see our leopard gecko heating guide.

Without UVB Lighting (Most Common Setup)

Simplified option (no schedule to track): Use Repashy Calcium Plus at every feeding. No separate multivitamin needed.

With UVB Lighting (6+ Hours Daily)

Pro Tip: If you recently added UVB to an enclosure that previously relied on D3 supplementation, reduce D3 supplement frequency immediately. Don't wait until the current jar is empty — the switch should happen the day UVB goes live.

Adjusted Schedules for High-Demand Animals

Juvenile geckos (0–12 months):

• Without UVB: calcium with D3 at every feeding, multivitamin once per week
• With UVB: calcium with D3 every other feeding, plain calcium other feedings, multivitamin once per week

Breeding and gravid females:

• Increase to calcium with D3 at every feeding regardless of UVB status
• Multivitamin once per week
• Plain calcium dish always available — gravid females significantly increase voluntary calcium consumption
• See our breeding gecko vitamins guide for complete protocols

The Shake-and-Bake Dusting Technique

Proper dusting technique matters. Poorly dusted insects deliver a fraction of the calcium and vitamins the supplement label promises.

The shake-and-bake method:

1. Place feeder insects in a small zip-lock bag or plastic container
2. Add a small pinch of calcium powder — less than you think you need (a light coating, not a thick crust)
3. Close and gently shake for 5–10 seconds until insects are lightly coated
4. Transfer insects to the enclosure immediately — the longer dusted insects sit, the more powder they shed
5. Feed within 2–3 minutes of dusting for maximum delivery

Common mistakes:

• Over-dusting (thick white coating) — causes insects to groom themselves frantically, shedding most of the powder before your gecko catches them
• Dusting and waiting — powder falls off within minutes; feed immediately
• Dusting mealworms in a dish — the powder falls to the bottom where your gecko cannot access it; dust in a cup with a tight lip instead
• Using supplements past 12 months after opening — D3 and vitamins degrade significantly; potency loss is invisible

For gut-loading recommendations that further improve feeder insect nutritional quality before dusting, see our best insect gut load guide. Well-gut-loaded insects carry nutrients inside their bodies that dusting alone cannot provide.