If you've searched "what vitamins are good for kidneys" or "what is the best vitamin for kidneys", the honest UK answer is: there is no single "kidney vitamin" that fixes everything. There are, however, a handful of vitamins where the evidence — and NHS guidance — is clear.

The vitamins UK guidance actually backs

1. Vitamin D — the one almost every adult should consider

The NHS recommends a daily 10 µg (400 IU) vitamin D supplement for all UK adults during autumn and winter, because UK sunlight is too weak to make enough. The kidneys are responsible for the final activation of vitamin D — making it especially relevant for kidney health.

2. B-complex (folate, B6, B12)

Water-soluble B vitamins are commonly low in chronic kidney disease, particularly in dialysis patients. Moderate doses of folate, B6 and B12 are generally well tolerated and frequently included in UK renal vitamins (Renavit, Dialyvit) and kidney-conscious multivitamins.

3. Vitamin C — at sensible doses

60–90 mg per day supports collagen, iron absorption and immune function without the oxalate stone risk associated with megadoses above 1,000 mg.

4. Vitamin K — usually from food

Found in leafy greens. Low-dose supplements are generally fine, but anyone on warfarin should keep their vitamin K intake stable rather than swinging up and down.

Vitamins to be careful with

  • Vitamin A (retinol) — accumulates in CKD; avoid high-dose supplements.
  • High-dose vitamin C (above 1,000 mg) — kidney stone risk.
  • High-dose vitamin E — not recommended for the general UK adult population.

Minerals that matter alongside the vitamins

  • Iron — only if deficient on a blood test.
  • Selenium — small amounts from food; UK soils are low.
  • Zinc — moderate doses only.
  • Potassium and phosphate — should be absent from any kidney-conscious supplement.

What to look for on the label

  1. Doses close to UK RNI — not 5,000% of RNI.
  2. Vitamin D included (especially in winter).
  3. No added potassium or phosphate.
  4. Low or no vitamin A (retinol).
  5. UK manufactured in a GMP-certified facility.

Bottom line

The best vitamins for kidney health in the UK are vitamin D, the B-complex group and modest vitamin C — all at sensible doses, with no added potassium or phosphate. Anything labelled "kidney detox" or "5,000% RNI" is a marketing claim, not a kidney benefit.