Vanadium / Vanadyl Sulfate
Vanadium (IV) sulfate oxide; oxo[sulfato(2-)-O]-vanadium
Also known as: Super Vanadyl Fuel · Vanadium (IV) sulfate oxide · Vanadium oxysulfate · Oxo[sulfato(2-)-O]-vanadium · Oxysulfato vanadium (IV) · Vanadyl (IV)-sulfate hydrate
Reviewed by the VetSheet Veterinary TeamUpdated Apr 5, 2026Evidence-based veterinary reference
Doses are a clinical reference for licensed veterinary professionals. Always confirm against the current label and the individual patient.
Dosing by species
🌎 NA — North America🌍 EU — Europe
Cats
| Indication | Dose | Route | Frequency | Duration | Region |
|---|---|---|---|---|---|
| Adjunctive treatment for diabetes mellitus | 1/2 capsule PO once daily with food | PO | q24h | — | 🌎 NA |
| Adjunctive use in treating feline type 2 diabetes | 0.2 mg/kg PO once daily in food or water | PO | q24h | — | 🌎 NA |
| Diabetes mellitus | 1 mg/kg PO once daily (vanadyl sulfate) OR 0.2 mg/kg PO once daily (vanadium) | PO | q24h | — | 🌎 NA |
| Early NIDDM | One capsule PO once daily | PO | q24h | — | 🌎 NA |
- Adjunctive treatment for diabetes mellitus: Using Super Vanadyl Fuel® (Twin Labs; also contains chromium)
- Adjunctive use in treating feline type 2 diabetes: Salt not specified, assume elemental vanadium
- Early NIDDM: Using Vanadyl Fuel® (Twin Labs; also contains chromium)
Doses are a clinical reference for licensed veterinary professionals. Always confirm against the current label and the individual patient.
Overview
Vanadium (often supplemented as vanadyl sulfate) is a trace mineral that has gained attention as a nutraceutical for its potential insulin-mimetic properties.
- Used primarily as an adjunctive treatment for feline diabetes mellitus (especially Type 2 / non-insulin dependent diabetes mellitus [NIDDM]).
- Efficacy remains controversial in veterinary medicine, but it is generally considered safe at recommended doses.
- Does not influence blood glucose levels in normal, healthy patients.
Clinical Pearl: Because dietary supplements are not FDA-regulated for purity or potency, the actual elemental vanadium content can vary significantly between brands. Vanadyl sulfate reportedly contains 31% elemental vanadium, but labeled amounts vary considerably.
Mechanism of action
Vanadium acts as an insulin mimetic through complex intracellular signaling mechanisms:
- Inhibits protein tyrosine phosphatase (PTP) → prevents the dephosphorylation (inactivation) of the insulin receptor → prolongs and amplifies insulin signaling.
- Enhances peripheral glucose disposal and uptake into skeletal muscle.
- Reduces hepatic glucose release.
- Because PTP is crucial in signal transduction, vanadium can act via both insulin-dependent and insulin-independent pathways.
Safety & warnings
Contraindications
- Renal insufficiency (use with caution as it may exacerbate the condition)
Adverse effects
- Anorexia
- Vomiting
- Renal toxicity (at high dosages)
Precautions
Use with caution in patients with pre-existing renal insufficiency, as vanadium supplements could potentially exacerbate the condition. High dosages may have direct renal toxic effects. Bioequivalence between different over-the-counter brands cannot be assumed.
Drug interactions
May have additive hypoglycemic effects when used concurrently for diabetes management.
Monitoring
- Fasting blood glucose
- Appetite and attitude
- Body condition
- PU/PD resolution
- Serum fructosamine
- Glycosylated hemoglobin levels
- Renal function parameters (BUN, Creatinine, SDMA) due to potential renal toxicity
Pharmacokinetics
Absorption
Poorly absorbed orally; only about 5% is absorbed from foodstuffs.
Distribution
In vivo, it is converted to the vanadyl cation and forms complexes with ferritin and transferrin. Highest vanadium concentrations are found in the liver, bone, and kidney.
Metabolism
Inorganic trace element; forms complexes with transport proteins.
Elimination
Eliminated primarily via renal routes. Effects on glucose in NIDDM humans may persist for weeks after discontinuation of therapy.
Overdose
Vanadyl sulfate may be mildly toxic. The oral LD50 in rats is 450 mg/kg.
- Acute Overdose: Consider gut removal protocols if an acute overdose occurs. Contact an animal poison control center for further guidance.
- Chronic Overdose: May cause significant kidney damage.
Available products
Formulations
- Tablets
- Capsules
Human-labeled
- 7.5 mg tablets
- 10 mg tablets
- 15 mg capsules
- Super Vanadyl Fuel® (combination product containing 1.25 mg elemental vanadium and 150 mcg chromium per capsule)
Regulatory status
No regulatory data for: 🇺🇸 US · 🇪🇺 EU · 🇬🇧 UK · 🇭🇰 HK · 🇹🇼 TW · 🇯🇵 JP · 🇰🇷 KR · 🇦🇺 AU
Storage & stability
Stable under ordinary conditions. Refer to the label for each specific product used.
Client information
- Give with food to minimize the chance of stomach upset.
- Do not switch brands without consulting your veterinarian. Because these are nutritional supplements, the actual amount of active ingredient can vary widely between different products.
- Watch for signs of stomach upset, such as vomiting or loss of appetite. If your cat initially cannot tolerate it, your vet may temporarily stop and then restart the therapy.
- Monitor your cat's drinking and urination habits, as well as overall energy levels, to help assess if their diabetes is well-controlled.
VetSheet drug reference is intended for licensed veterinary professionals as a clinical decision-support aid, not a substitute for professional judgement or the manufacturer’s current label.