Broccoli Sprout Extract with Myrosinase

Description

Broccoli sprout extract supplying glucoraphanin together with active myrosinase, the plant enzyme that converts it. Sixty servings, about 57 cents each. Almost every other broccoli sprout extract on the market sells the precursor alone, because heat during processing destroys the enzyme and nobody wants to pay to keep it alive. That single difference is what this product is, and it is worth understanding before comparing prices.

What is in the capsule

Why a broccoli sprout extract is not sold as sulforaphane

Sulforaphane is the compound the research is about and it is chemically unstable, degrading in storage and in heat. So the industry sells the stable precursor instead and leaves the conversion to happen after swallowing. In an intact plant that conversion is done by myrosinase, which sits in a separate compartment and meets the glucosinolate when the tissue is damaged by chewing.

Take the enzyme out and conversion depends on gut bacteria, and published measurements of that route found it varies several fold between individuals and is generally much less efficient. Supplying both parts is the reason this costs more than a plain glucoraphanin capsule.

Broccoli sprout extract against eating broccoli

Mature florets carry glucoraphanin at a fraction of the concentration found in three day old sprouts, which is why sprouts are grown for extraction at all. Cooking is the other variable, because boiling destroys myrosinase, so a cooked portion relies on gut bacteria for conversion exactly as an enzyme free capsule does. Raw sprouts are the cheapest route and the hardest to keep eating, and that is the honest comparison a broccoli sprout extract should offer.

Storing a broccoli sprout extract, and why the date matters

An enzyme is a protein and proteins denature. Heat and humidity degrade myrosinase activity, so a bottle left in a hot car or a steamy bathroom loses the feature it was bought for. The activity figure on the certificate describes the lot as it was packed. Keep a broccoli sprout extract sealed, cool and dry, and finish it rather than storing it for two years.

The micromole problem on a label

Glucosinolates are conventionally dosed in micromoles in the scientific literature and in milligrams on retail labels, and the two do not convert in your head. A 100 micromole dose of glucoraphanin is roughly 44 mg of the compound, so a milligram figure alone cannot be matched against a published protocol without arithmetic.

Both units are printed on this panel for that reason. It is the same problem as IU against micrograms on vitamin D, which the vitamins page handles the same way: print both and let the buyer skip the conversion.

What the studies measured

Bioavailability studies compared glucoraphanin given with and without active myrosinase and measured urinary sulforaphane metabolites, finding substantially higher recovery when the enzyme was present. Intervention trials have used roughly 100 to 200 micromoles a day and measured gene expression markers, detoxification enzyme activity and urinary conjugates of airborne pollutants.

That describes the doses administered and the endpoints recorded in the published work. It is not a claim about this bottle, which is a food, and the units on the panel are there so you can do the comparison without taking anyone’s word for it.

Taste and handling

Broccoli sprout material smells of broccoli, strongly, and the capsule does nothing to hide it. Keep the bottle closed and cool, since the enzyme is the fragile part of the formula and heat is what kills it in the first place.

Testing

Every lot of broccoli sprout extract is assayed for glucoraphanin content and for myrosinase activity by an independent laboratory, with heavy metals, pesticides and microbials screened alongside. An enzyme claim that is not measured is just a sentence, so the activity figure is on the published certificate. The rest of the range sits on the greens and wholefood page, with intake references at the NIH fact sheet library.