Is Vitamin D3 / Cholecalciferol safe for Cats?
✓ Sources checked by the Eaoae Safety Review · 2026-11-04 · Based on 3 sources
No, vitamin D3 (cholecalciferol) is unsafe for cats in excess. Overdose causes hypercalcemia -- dangerous calcium buildup that mineralizes kidneys and other tissues, leading to kidney failure. Cats are exposed via supplements and cholecalciferol-based rodenticides.
🚨 Emergency: Yes — contact your veterinarian immediately.
💡 Why
In cats, cholecalciferol overdose follows the same mechanism as in dogs: conversion to calcitriol, runaway calcium/phosphorus elevation, and soft-tissue mineralization with acute kidney injury as the main killer. Signs (vomiting, lethargy, increased thirst) are delayed 12-36 hours, and the long half-life means weeks of treatment. Cats may encounter it in spilled supplements, flavored chews, or rodent baits.
🩺 What to do
- Contact your vet immediately if ingestion is suspected.
- Bring the product packaging -- the vet needs the exact cholecalciferol content.
- Expect prolonged monitoring; this toxin clears very slowly.
❓ Common questions
Are cats as sensitive as dogs?
Yes -- cats are equally susceptible to cholecalciferol's calcium-raising effects and resulting kidney damage.
What should I watch for?
Vomiting, depression, increased thirst and urination, progressing to dehydration and shutdown as kidneys fail.
How do I cat-proof against it?
Keep vitamin supplements secured and choose rodent control methods that do not use cholecalciferol baits.
📚 Sources
- Which Supplements and Vitamins Are Dangerous for Pets?
- Pet Poison Helpline: Cholecalciferol Toxic To Dogs
- Pet Poison Helpline: Top Terrible Toxins
- MSD Veterinary Manual: Vitamin D Toxicosis
🔎 How the sources compare
What each authority says about Vitamin D3 / Cholecalciferol \u2014 compiled 2026-10-28. Eaoae’s verdict summarizes these sources; it is not our own diagnosis.
| Source | Dogs | Cats | Dose info |
|---|---|---|---|
| ASPCA Animal Poison Control | Overdoses of vitamin D3 will often lead to vomiting, diarrhea and lack of appetite in pets. In very high doses, calcium levels in the body elevate, which may lead to kidney damage and mineralization of the soft tissues. | Overdoses of vitamin D3 will often lead to vomiting, diarrhea and lack of appetite in pets. In very high doses, calcium levels in the body elevate, which may lead to kidney damage and mineralization of the soft tissues. | — |
| Pet Poison Helpline | Cholecalciferol (vitamin D3) rodenticide causes a very high calcium and phosphorus level in the body, resulting in severe, acute kidney failure that develops 2-3 days after ingestion. There is no specific antidote, and the margin of safety is very narrow, so small ingestions may be fatal for any dog or cat. | Cholecalciferol (vitamin D3) rodenticide causes a very high calcium and phosphorus level in the body, resulting in severe, acute kidney failure that develops 2-3 days after ingestion. There is no specific antidote, and the margin of safety is very narrow, so small ingestions may be fatal for any dog or cat. | — |
| Merck Veterinary Manual | Cholecalciferol (vitamin D3) disrupts calcium and phosphorus homeostasis, causing hypercalcemia, metastatic soft-tissue mineralization, and renal injury or failure; clinical signs may appear within 12-48 hours. There is no antidote. | Cholecalciferol (vitamin D3) disrupts calcium and phosphorus homeostasis, causing hypercalcemia, metastatic soft-tissue mineralization, and renal injury or failure; clinical signs may appear within 12-48 hours. There is no antidote. | Clinical signs may be noted at doses as low as 0.1 mg/kg; appreciable calcium/phosphorus elevations and mineralization occur above 0.5 mg/kg; an acute lethal dose of 13 mg/kg and an LD50 of 88 mg/kg are recognized (page does not split these figures by species) |
| VCA Hospitals | High doses of vitamin D3 (cholecalciferol) cause severe hypercalcemia and hyperphosphatemia, and untreated poisoning leads to mineralization of the kidneys, heart, blood vessels, lungs and stomach, with kidney failure the most common outcome. There is no antidote, and the amount in a single bait block is a severe overdose in nearly all animals. | In VCA's vitamin D poisoning article for cats, poisoning most commonly comes from vitamin D3 rodenticide baits, supplements, or psoriasis creams; clinical signs appear 12 to 36 hours after ingestion, and untreated cats may die, with higher doses causing kidney failure, abnormal heart rhythms, and mineralization of body tissues. | — |
| Eaoae summary (cats) | ⛔ Unsafe \u2014 Known to be harmful or toxic. Keep it away from your pet. | ||
🔗 Related checks for cats
- Chicken ✅ Safe
- onion powder ⛔ Unsafe
- Bread ⚠️ Caution
- Strawberry ⚠️ Caution
- grapes ⛔ Unsafe
- Cat Grass ✅ Safe
Checked with Eaoae’s safety lookup. Answers are generated for reference and may be incomplete — always confirm with your vet for your individual pet. Spotted an error? Let us know.
