Overview
What it is and who it suits
Rep-Cal Calcium with Vitamin D3 is a finely ground, phosphorus-free calcium carbonate supplement formulated specifically for reptiles and amphibians kept in captivity. Sourced from a natural calcium deposit, the powder is designed to be dusted onto feeder insects or fresh produce before offering it to your pet, ensuring that captive reptiles receive the calcium they would naturally obtain through a varied wild diet. Because captive diets often lack the mineral balance found in nature, this supplement helps bridge that nutritional gap, supporting proper bone density and skeletal structure in species ranging from leopard geckos and bearded dragons to tortoises, iguanas, and chameleons.
The addition of vitamin D3 makes this formula particularly valuable for reptiles housed without adequate access to natural, unfiltered sunlight. Vitamin D3 is essential for calcium absorption and utilization, and without it, even calcium-rich diets can fail to prevent deficiencies. This is especially important for indoor enclosures where UVB exposure may be inconsistent or insufficient. Rep-Cal's ultrafine powder consistency allows it to cling easily to crickets, mealworms, dubia roaches, and leafy greens, making supplementation simple and mess-free during regular feeding routines.
Consistent use of Rep-Cal Calcium with Vitamin D3 plays a critical role in preventing metabolic bone disease, a common and serious condition in captive reptiles caused by calcium deficiency or imbalance. Breeders, hobbyists, and reptile keepers rely on this product as a staple part of husbandry, often alternating it with other multivitamin supplements to maintain a well-rounded nutritional regimen. Its phosphorus-free formula ensures proper calcium-to-phosphorus ratios, which is vital for long-term health, strong shell and bone development, and overall vitality in reptiles, amphibians, and other exotic pets kept outside their natural habitat.
What stands out
- 01Phosphorus-free ultrafine calcium carbonate powder
- 02Formulated with Vitamin D3 for calcium absorption
- 03Sourced from natural California oyster shell deposits
- 04Suitable for all reptiles, amphibians, birds, and invertebrates
- 05Fine powder texture for easy dusting of feeder insects and produce
- 06Helps prevent Metabolic Bone Disease (MBD)
Specifications
The numbers that matter
| Container Size | 3.3 oz / 93.5 g |
|---|---|
| Form | Ultrafine powder |
| Active Ingredients | Calcium carbonate, Vitamin D3 |
| Recommended Use Frequency | 2-3 times per week (species dependent) |
| Shelf Life | 24 months from manufacture date |
Pros & cons
Where it shines, where it doesn't
What we like
- Essential for reptiles kept without UVB lighting
- Easy to use shaker-top container
- Trusted brand recommended by many herp veterinarians
- Long shelf life when stored properly
- Works well for gut-loading feeder insects
- Affordable relative to supplement longevity
Watch out for
- Overuse of D3 can lead to toxicity if not dosed correctly
- Fine powder can clump in humid environments
- Not suitable as sole supplement long-term without variety
- Some reptile species require D3-free alternative version
- Packaging lid can be prone to spilling if not sealed tightly
The verdict
Rep-Cal Calcium with Vitamin D3 remains a staple supplement for reptile keepers needing to support healthy bone development, particularly for species housed without adequate UVB exposure. Its fine, easily dusted powder and reliable calcium-to-D3 ratio make it a trusted choice, though keepers should monitor dosing frequency and species-specific D3 needs to avoid oversupplementation.Check current price
