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Vitamin A

TL;DR

something.

Fat soluble so take with food containing fat.

Retinol is vitamin A1.

The UK's NHS recommends 700 µg a day for men and 600 µg a day for women.

Found in cod liver oil. Based on UK recommendations two typical doses of cod liver oil will provide double your RDA of vitamin a.1 This may be an issue and if you supplement with cod liver oil and a multivitamin you should ensure you take a multivitamin that does not include vitamin a.

Avoid taking vitamins, minerals (such as calcium) and other supplements for 30-60 minutes after consuming coffee - it contains compounds (polyphenols) that limit the absorption of many micronutrients.

Something about bones.

Food Sources

Forms/Types

Quality

As with all supplements - buyer beware. It's quite common for supplements to be contaminated with a variety of impurities, often in the form of heavy metals, and/or contain far more or less of the ingredients stated on the label. There's no simple rule of thumb to avoid this, such as avoiding cheap or imported products; expensive or well-known brands produced in-country may be just as bad. Ideally you should take some time to find products (if you can) that;

  • have been laboratory tested on behalf of the manufacturer by a reputable body or company that operates in your country or region (here's an example of a Peak Supps creatine supplement available on Amazon in the UK which has been tested by Eurofins: Creatine Monohydrate Powder 1Kg | Pure Micronised | Packaging May Vary - see pictures 3 & 4)
  • have been laboratory tested by an independent testing company that ranks product purity and ingredient amount accuracy on behalf of consumers (usually funded by affiliate sales of those products). An example of this is Labdoor.

Dosage - How Much?

Deficiency - Too Little

Toxicity - Too Much

Caution required.

Side Effects

When to Avoid Use - Interactions/Contraindications

Random Facts

References

  1. Cod Liver Oil 1000mg, 360 Capsules of High Strength Fish Oil, Rich in Omega 3. Supports Heart Health, Brain Health, Eye Health and Normal Blood Pressure - retrieved 2025-09-30, the brand is Zipvit ↩