Vitamin B8, better known as inositol, is one of the more misunderstood names in the supplement aisle – starting with the fact that it isn't really a vitamin at all. Here's what inositol actually is, where it's found, and some honest context on how it's used.
What is vitamin B8?
Despite the "B8" label, inositol isn't technically a vitamin. A vitamin, by definition, is something your body can't make and must obtain from food – but your body can produce inositol itself, from glucose. It's more accurately described as a naturally occurring sugar-like compound, present in your body's cells and in many everyday foods.
You'll sometimes see it grouped with the B vitamins for historical reasons, and it remains a familiar name in the wellness space. It's worth being clear and honest, though, about the regulatory picture: inositol does not currently hold any authorised health claims in Great Britain. That means that while you may see all sorts of claims made about it elsewhere online, we're not able to tell you it does specific things for your health – and we'd rather be straight with you about that than repeat claims we can't stand behind.
Where is inositol found?
As well as being produced naturally in the body, inositol is found in a variety of foods. Good sources include wholegrains, nuts, seeds, soy products, beans and citrus fruits, and you'll also find it in high-bran cereals and artichokes. Most people take in some inositol as part of a normal, varied diet without ever thinking about it.
Should I take an inositol supplement?
Inositol is available as a supplement, usually in capsules and powders across a range of strengths. Because it carries no authorised health claims, we can't recommend it for any particular health purpose – and if you've read about inositol in connection with a specific health condition, that's exactly the kind of situation where you should talk to a doctor or pharmacist rather than self-prescribe.
This is genuinely important with inositol, because much of the research around it sits in a clinical, medical context rather than a general-wellness one. If you're considering it for a specific reason – particularly if you're pregnant, trying to conceive, or taking other medications – please speak with a healthcare professional first. They can give you advice tailored to your circumstances, which is far more useful than anything a product page can tell you.
Inositol is generally well tolerated, though taking higher amounts can occasionally cause mild effects like nausea or headaches. As with any supplement, it's sensible to follow the dosage on the label.
Explore our range of inositol supplements. If you're considering inositol for a specific health reason, please speak to your pharmacist or GP first.