Key compounds in brassica microgreens

Sulforaphane

Sulforaphane is an isothiocyanate produced when glucoraphanin (its precursor) meets the enzyme myrosinase during chewing or cutting. It's the most studied compound in brassica microgreens. Sulforaphane activates the Nrf2 pathway, which controls over 500 genes involved in detoxification, antioxidant production, and inflammation control. Research links it to cancer prevention, neuroprotection, metabolic health, and detoxification of environmental pollutants. Broccoli microgreens and sprouts contain 10 to 100 times more glucoraphanin than mature broccoli. The enzyme that converts it is destroyed by cooking, so raw consumption from a living tray delivers the most.

Glucosinolates

Glucosinolates are sulfur-containing compounds found across the brassica family. When plant tissue is damaged, the enzyme myrosinase breaks them down into biologically active products including isothiocyanates, nitriles, and thiocyanates. Different brassica varieties contain different glucosinolate profiles. Radish microgreens contain 3.8 times more glucosinolates than mature radish roots. Red cabbage microgreens contain roughly double the glucosinolate concentration of mature red cabbage. The health effects of glucosinolates include antiproliferative, antidiabetic, antioxidant, and hepatoprotective activity.

Vitamin C (ascorbic acid)

Vitamin C functions as an antioxidant, supports immune function, and is essential for collagen synthesis. Among 25 microgreen varieties tested by USDA scientists, red cabbage microgreens had the highest vitamin C concentration. Total vitamin C across varieties ranged from 20 to 147 milligrams per 100 grams of fresh weight. The "Asia Red" radish variety measured 236 mg per 100 grams dry weight. Vitamin C degrades rapidly after harvest through oxidation. Living microgreens continue producing it until the moment you cut them.

Vitamin E (tocopherols)

Vitamin E is a fat-soluble antioxidant that protects cell membranes from oxidative damage. The most active form, alpha-tocopherol, is abundant in radish microgreens, particularly the Sango (red) cultivar. A 2026 meta-analysis in Scientific Reports found red cabbage microgreens contain 40 times more vitamin E than mature red cabbage. Research has shown alpha-tocopherol can have anti-tumor effects by modulating immune activity and inducing apoptosis in cancer cells.

Vitamin K (phylloquinone)

Vitamin K is essential for blood clotting and bone metabolism. Garnet amaranth microgreens had the highest vitamin K concentration among the 25 varieties tested by USDA researchers, but brassica varieties including cabbage and kale also contain significant amounts. Microgreens consistently outperform their mature counterparts in vitamin K density.

Beta-carotene

Beta-carotene is a carotenoid that the body converts to vitamin A. It supports vision, immune function, and skin health. Green daikon radish microgreens showed particularly high concentrations in USDA testing. Carotenoid levels across 25 microgreen varieties ranged from 0.6 to 12.1 mg per 100 grams fresh weight. Light quality during growth directly affects carotenoid accumulation. Blue and red LED combinations produce the highest levels.

Lutein and zeaxanthin

These carotenoids accumulate in the retina and protect against macular degeneration and oxidative damage to the eyes. Red cabbage microgreens contain 30 times more lutein and zeaxanthin than mature red cabbage. Both compounds are fat-soluble, so eating microgreens with a source of dietary fat improves absorption.

Anthocyanins

Anthocyanins are water-soluble pigments responsible for the red, purple, and blue colors in plants like red cabbage and purple radish microgreens. They function as antioxidants and have demonstrated anti-inflammatory, anticancer, antiviral, and cardiovascular protective effects in research. Recent studies suggest anthocyanins influence gut microbiota composition, which may amplify their anti-inflammatory effects. Purple radish (China Rose) cultivars are particularly high in anthocyanins. Growing conditions, especially light spectrum, significantly affect anthocyanin production. Red and blue LED light combinations increase levels.

Phenolic compounds and flavonoids

Phenolics are a broad class of plant compounds with antioxidant properties. Flavonoids are a subclass with documented anticancer, anti-inflammatory, neuroprotective, and cardioprotective effects. Brassica microgreens contain high concentrations of both. Broccoli microgreens showed the highest overall polyphenol and carotenoid content among five brassica species tested. Radish variety "Koregon Red" measured 280.53 mg total phenolics per 100 grams. Flavonoids have an interesting dual behavior: under normal conditions they act as antioxidants, but in cancer cells they can act as pro-oxidants, inducing cell death.

Isothiocyanates

Isothiocyanates are the biologically active breakdown products of glucosinolates. Sulforaphane is the most studied isothiocyanate, but brassica microgreens produce several others depending on the variety. Their mechanisms include suppressing inflammatory signaling (NF-kB), inhibiting angiogenesis, promoting cancer cell apoptosis, and enhancing phase II detoxification enzymes. The conversion from glucosinolates to isothiocyanates requires active myrosinase, which is present in raw, uncooked microgreens.

Chlorophyll

Chlorophyll gives microgreens their green color and is produced during the greening phase of growth under light. Beyond its role in photosynthesis, chlorophyll has antioxidant properties and may support detoxification in the body. Broccoli microgreens had the highest chlorophyll content among five brassica species compared. The 3-3-3 growing lifecycle (weight, blackout, greening) is designed to maximize chlorophyll production in the final days before harvest.

Minerals: potassium, calcium, iron, zinc, magnesium

Brassica microgreens contain meaningful amounts of essential minerals. Potassium and calcium are the most abundant. Iron and zinc are present in lower but significant concentrations. Research shows mineral content can be manipulated through growing conditions. One study found potassium could be increased by nearly 50% by adjusting photoperiod and temperature. Substrate choice also matters: vermiculite-grown microgreens showed significantly higher iron, zinc, and manganese than those grown on cocopeat.

Fiber

While microgreens are harvested young, they still contain dietary fiber from their stems and cotyledons. Fiber supports gut health, feeds beneficial bacteria, and slows glucose absorption. The fiber content of microgreens is modest compared to mature vegetables due to their small size, but regular consumption as part of a daily protocol contributes to overall intake. The prebiotic effects of brassica microgreens on gut microbiota are an active area of research, with arugula and red cabbage showing significant effects on microbial populations in 2025 studies.