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Limited evidenceHeart & metabolic

Vanadium

Vanadium salts genuinely mimic insulin in cell and animal models, but the human trials are tiny, mostly uncontrolled, and used doses roughly 10,000 times dietary intake with real toxicity. No vanadium compound has ever cleared a phase 3 trial, and the 1990s bodybuilding claims failed outright.

What the science says

  • Insulin sensitivity in type 2 diabetes Limited evidence

    In a controlled study, vanadyl sulfate ~100 mg/day for 3 weeks improved hepatic and peripheral insulin sensitivity in people with type 2 diabetes but had no effect in obese non-diabetic subjects. Across the literature, trials enrolled fewer than 20 patients each, most lacked blinding or a placebo arm, and effects on HbA1c were small and inconsistent.

  • Clinical development as a diabetes drug Limited evidence

    A review of the field concluded that despite three decades of work, no vanadium compound has completed phase 3 testing, largely because the therapeutic window between glucose-lowering doses and gastrointestinal and renal toxicity is narrow. Vanadium accumulates in bone and kidney with chronic dosing.

  • Muscle mass and strength Limited evidence

    A controlled trial of oral vanadyl sulfate (0.5 mg/kg/day) over 12 weeks in weight-training athletes found no meaningful change in body composition; only a marginal effect appeared on a single strength measure, easily attributable to chance across multiple endpoints. The "anabolic vanadyl" marketing from the 1990s was never supported.

  • Nutritional essentiality Limited evidence

    No human vanadium deficiency syndrome has been identified, and there is no RDA or Adequate Intake. Typical dietary intake is roughly 10-30 mcg/day from grains, mushrooms and shellfish, and no controlled trial shows benefit from supplementing that in healthy people.

Dosage & safety

Studied doseThere is no established supplemental dose. Ordinary dietary intake is ~10-30 mcg/day. Consumer supplements typically supply 7.5-10 mg of elemental vanadium — already above the tolerable upper intake level of 1.8 mg/day for adults. Research doses were far higher: 100-300 mg/day of vanadyl sulfate (about 31-94 mg elemental vanadium) for 3-6 weeks.
SafetyAt pharmacologic doses the dominant side effects are gastrointestinal: nausea, abdominal cramping, diarrhea, and a characteristic green discoloration of the tongue. Animal studies show nephrotoxicity and accumulation in kidney and bone with chronic dosing. The adult tolerable upper intake level is 1.8 mg/day of elemental vanadium, and many products exceed it. Avoid entirely in kidney disease. Vanadium should not be used to self-treat diabetes — additive hypoglycemia with insulin or sulfonylureas is plausible, and it displaces evidence-based therapy. Also avoid in pregnancy and lactation, where no safety data exist.

Scientific references

Where to buy

Source Naturals, Vanadyl Sulfate, 10 mg, 100 Tablets

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