A compound found in broccoli made tiny lab roundworms live more than 50% longer at the most effective doses, researchers report in a study published in the journal PLOS Aging and Health1. The compound, sulforaphane, also made treated worms look younger on a new measure of aging built from gene activity1. The effect only appeared when treatment started early in the worms’ lives1.
The study was done in a worm called C. elegans, not in people. A summary of the work states plainly that the results do not establish that sulforaphane supplements extend human lifespan1.
What happened
Sulforaphane belongs to a family of sulfur-containing compounds that come from cruciferous vegetables, the group that includes broccoli1. Earlier research had linked it to lower inflammation and oxidative stress, a kind of chemical wear on cells, and to slower growth of cancer cells in the lab1.
The research team, led by Christine A. Sedore and Erik Segerdell, tested the compound in roundworms at different doses and at different ages to see whether it could act as a natural candidate for longer life1. The paper is titled “The broccoli derivative sulforaphane extends lifespan by slowing the transcriptional aging clock”1.
What the researchers measured
The headline result is lifespan. At the most effective doses, treated worms lived more than 50% longer than untreated ones1.
Timing turned out to matter. According to the study summary, treatment had to begin early in life to work1. Worms that got the compound later did not show the same benefit.
The team also wanted to know whether the worms were simply surviving longer or actually aging more slowly. To check, they built what they call a gene-specific “transcriptional aging clock”1. In plain terms, this is a yardstick that reads which genes are switched on or off in a worm and estimates how old its body looks from that pattern. Treated worms came out about four days younger than untreated worms of the same age, which the summary describes as a nearly 20% drop in biological age1. The researchers read this as a sign that the compound slows the molecular process of aging rather than just extending survival1.
A mild stress that triggers defenses?
The clearest changes in gene activity showed up in detoxification pathways, the systems cells use to clear out harmful chemicals1. Together with how the effect changed across doses, the researchers say this points to a likely “hormetic” response1. Hormesis is the idea that a small, mild stress can push the body to switch on its own protective machinery1. The summary lists two well-known worm longevity genes, daf-16 and skn-1, among the study’s keywords1, but the summary available to Biohack does not detail what the team found about each one.
More broadly, the authors say the findings fit the idea that strong lifespan-extending treatments work through wide effects across the whole animal, visible as system-level shifts in gene activity1.
What it does not show yet
This is a study in worms. C. elegans are tiny, transparent roundworms that seem very different from humans, even if parts of their biology are useful for studying aging2. A result in this animal is a starting point for more research, not evidence about people. The study summary itself says the findings do not show that taking sulforaphane extends human lifespan1.
Several details are not covered in the summary Biohack reviewed:
- how many worms were tested, or the exact doses used;
- whether any doses were harmful, or how the effect changed at the highest amounts;
- whether the result has been repeated by another lab;
- how the new aging clock compares with other ways of measuring age in worms.
The “four days younger” result also comes from a clock the team built for this work1. A gene-activity reading is a lab measure of aging, not a direct measure of health, and new clocks need testing by others before their readings can be compared across studies.
Who is behind it
The authors listed on the paper are Christine A. Sedore, Erik Segerdell, A. L. Coleman-Hulbert, E. Johnson, J. N. Levi, Gordon J. Lithgow, Monica Driscoll and Patrick C. Phillips1. The sources available to Biohack do not describe who funded the work or any company ties among the authors.
The independent coverage Biohack read was published by Bioengineer.org, which credits the original write-up to the science news site Scienmag1.
How it fits the field
This is not the first time sulforaphane has been tested in worms. In 2021, a team from Germany led by a researcher named Qi reported in the journal Aging that sulforaphane extended the average lifespan of C. elegans by 17%3. That study also reported that treated worms moved and ate better, built up 26% less lipofuscin, a pigment that collects in tissues with age, and survived a chemical stress test far better: 72% of treated worms were alive after 24 hours, against 31% of untreated worms3. In that work, the researchers linked the effect to the insulin-like signaling pathway, reporting that the compound dampened a gene called DAF-2 and allowed a protective gene called DAF-16 to become active3. An earlier experiment cited in the same write-up found that adding sulforaphane-rich broccoli to the diet of red flour beetles extended their lives by 30%3. That 2021 summary was published on the blog of ProHealth, a company that sells supplements3.
The new study reports a much larger lifespan gain at its best doses, more than 50%, though the two studies may differ in doses, worm handling and methods13.
Roundworms have long been a workhorse in aging research. A famous 1993 paper described a C. elegans mutant that lives twice as long as normal worms4. Other labs have used the worm to study how diet changes aging, including dietary restriction, which is eating less without malnutrition5. Researchers have also noted that some interventions keep affecting aging even after they stop5.
The finding that sulforaphane only worked early in life stands in contrast with other recent worm research. A perspective published on October 15, 2026 in the journal Geromedicine discusses experiments in which switching off the DAF-2 receptor in very old worms extended their lives, and asks how it is possible to double the lifespan of an organism already close to death4. Its authors propose a mathematical model in which such late gains come from changing how unstable the body’s regulation is, rather than from repairing built-up damage4. Taken together, these lines of work suggest that when a treatment starts can matter a great deal, and that the answer may differ from one treatment to another.
What to watch next
- Repeat results. Whether other labs see a similar lifespan gain in worms with sulforaphane, and whether the size of the effect holds up.
- The aging clock. Whether the team’s gene-based clock is used by others to test different compounds, which would show how well it tracks real aging.
- Other animals. Whether the effect, and the need to start early, shows up in flies, mice or other species.
- How it works. More detail on the detoxification and stress-defense genes the researchers point to as the likely route1.
For now, the result is a clear signal in a lab worm, measured both as longer life and as a younger gene-activity profile. It is not evidence that broccoli or sulforaphane supplements change how long people live1.
