Cruciferous supplements: what they are and how to choose

Last reviewed 16 October 2026Next review April 20273 sources

Cruciferous vegetables — broccoli, kale, cabbage, watercress — are nutrition darlings, and supplements built from them ride that reputation. This guide is the honest version: what a cruciferous supplement actually is, what can and cannot be claimed for it, and how to choose.

What a cruciferous supplement is

Cruciferous (or brassica) vegetables are the cabbage family — broccoli, cabbage, kale, radish, watercress, mustard and more. A cruciferous supplement concentrates extracts of several of these into a tablet. The compounds people talk about are glucosinolates and their breakdown products such as sulforaphane. A good product lists exactly which plants it uses; a whole-food-derived blend gives you a spread of the plant material rather than one isolated compound.

The honest part: what can and cannot be claimed

This is where cruciferous marketing gets ahead of the law. Cruciferous vegetables and their compounds — including sulforaphane and glucosinolates — carry no authorised health claims in Great Britain. So no one may make a health claim for a cruciferous supplement on the strength of its broccoli or cabbage content. Be wary of any seller who implies one.

Where these products can carry a claim, it is usually because of an added nutrient. If a cruciferous blend includes vitamin E at a meaningful level, one authorised claim applies — “vitamin E contributes to the protection of cells from oxidative stress” — provided the product supplies at least 15% of the reference intake per serving. That claim attaches to the vitamin E, not to the cruciferous extract, and it is worth knowing the difference so you can read a label accurately.

“Equivalent to a serving of vegetables” — read it carefully

A supplement is not a serving of vegetables. A real serving of broccoli brings fibre, water, volume and fullness, and it displaces less healthy foods on the plate — none of which a small tablet replicates. A supplement can add some concentrated plant material to the diet; it is not a substitute for eating the vegetables.

Food first — and here it wins easily

Of all the categories, cruciferous is one where food genuinely beats a supplement. Broccoli, cabbage, cauliflower, kale, Brussels sprouts, rocket and watercress are cheap, widely available, and bring far more than any capsule — and lightly cooking or eating some raw preserves more of the delicate compounds. A cruciferous supplement earns its place only as a top-up for people who eat very few of these vegetables and want some of the plant material in a tablet.

What to look for when buying

• Which plants, named on the label — a transparent blend beats a vague “cruciferous complex”.
• Any added vitamin E or C — these can carry the authorised claim that they contribute to the protection of cells from oxidative stress, where the cruciferous extract cannot.
• Whole-food-derived vs isolated, depending on whether you want a spread of plant material or a standardised single compound.
• Allergens. Cruciferous blends commonly include mustard and often soya — both are declarable allergens, so check.
• Value per day, not per bottle.

The NeoLife option

NeoLife Cruciferous Plus is a whole-food-derived blend of five cruciferous plants — broccoli, savoy cabbage, radish, watercress and mustard — with vitamin E. At 3 mg vitamin E (25% of the reference intake) per tablet it meets the threshold for the authorised claim that vitamin E contributes to the protection of cells from oxidative stress; the cruciferous extract itself carries no claim, and we do not imply one. It is 60 tablets, one a day (a two-month supply, about 47p a day). It contains soy and mustard, so check the label if you are allergic to either. £28.00.

Products in this guide

Cruciferous Plus£28.00 Subscribe & save 10%View product