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David Roberts
Host of the Volts newsletter and podcast, covering clean energy and decarbonization; formerly a staff writer at Grist and Vox.
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Nov 4, 2026
Not All Supplements are Created Equal
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38:02David RobertsGUEST
We've, yeah, we've, I mean, so all the ones that say they have sulforaphane, we've tested and it's good breath.
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38:08David RobertsGUEST
And, and we're at, you know, we're, we're conferences and John will speak and then we'll have doctors come up afterwards.
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38:15David RobertsGUEST
And so in, in, you know, John always says, you know, well, what I just said, the only, there are only two stabilized sulforaphane products on the market.
5 MINS LATER
Ep. 242 - Detox Demystified: everything you need to know to support your body's disposal system with David Mara
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8:18David RobertsGUEST
Well, it came into our conversation because we ended up growing Mara's cells in our lab, her cancer cells.
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8:32David RobertsGUEST
And he, Dr. John Gilday, was able to put 60 different supplements on her type of cancer to see what directly killed it.
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8:41David RobertsGUEST
So basically, he put... a cancer cell right next to a normal cell, like a renal proximal tubule cell.
18 MINS LATER
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26:20Fiona LovelyHOST
So what are they, where do they come from and why do we need to care about them?
If Data Centers Are Here To Stay, How Do We Make Them Work For Us?
9:20

Jeremy HobsonHOST
But what about that? Is there like just a limited sum of electricity? And if the data centers are taking more, that means that people are going to be paying more for their own power.
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9:32David RobertsGUEST
No, the short answer to that is no, that is not the right way to look at the electricity system for a number of reasons.
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9:48David RobertsGUEST
Which means that a lot of that electricity infrastructure, generating capacity, carrying capacity, is sitting around idle, not being used a lot of the year.
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9:58David RobertsGUEST
And so if a big load comes along, like a data center, that can soak up some of that capacity that's not being used without requiring any new capacity to be built, then you are sharing the same fixed costs of that infrastructure over a larger scale.
6 MINS LATER
Microplastics & Hidden Toxins: Protecting Your Health and Aging Well with David Roberts
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7:20David RobertsGUEST
You start chewing the broccoli, it releases an enzyme from the cell wall called myrosinase, and those two create a chemical reaction that cleaves a glucose molecule off the glucoraphanin and produces sulforaphane.
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7:35David RobertsGUEST
If you try to harness sulforaphane after that reaction, it degrades within hours because it's not stable.
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7:41David RobertsGUEST
And so all broccoli supplements except for two, because of that instability of sulforaphane and stability of glucoraphanin, have glucoraphanin in the capsule.
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7:53David RobertsGUEST
And so there's ours, the Broccoliate you just held up has a stable form of sulforaphane, and then one out of France called Approstaphane.
25 MINS LATER
691. How Microplastics Are Getting in Your Brain & Your Sperm w/ David Roberts
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42:15David RobertsGUEST
Yeah, I mean, it, uh, it, our interest got piqued when a researcher, uh, out of North Dakota, John Budvig, uh, was able to, he, he, without our knowing it, he bought some BroccoliT Plus, uh, and he basically did a, a study.
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42:31David RobertsGUEST
Um, he had a hypothesis he wanted to test, and he thought that if you take sulforaphane, it will mobilize microplastics out of your cells so that you can excrete them.
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42:42David RobertsGUEST
He used Bryan Johnson's blood test, and he sh- and, uh, he showed that he actually had the highest, um, blood microplastics level after they were mobilized of anyone human that they had seen at, at that time.
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42:58David RobertsGUEST
So that was last June of So that was June of 2025 and so we heard about the study in twen- August, which is when I texted you after I, I was here.
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43:08David RobertsGUEST
I was like, "Oh my gosh." We, um-- And so that got us interested and, I mean, I think it's important also to just-- Not everybody knows what-- I mean, of course, microplastics have been talked about a lot, um, but a microplastic is basically a microscopic, so sort of a dia-diameter of your hair fa- your, your hair's or, or less, um, that size piece of plastic that basically gets sloughed off, um, regular plastics.
Hit the brakes
33:16
35:55
Felicity HannahHOST
What does that mean for a business like yours and for the many, many other businesses and the 100,000 jobs all feeding into this giant company?
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33:39David RobertsGUEST
We've got Chinese vehicles taking an increasing share of markets all over the world, particularly China and now the UK.
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33:50David RobertsGUEST
We've also got the highest electricity costs in the developed world, which is a real problem.
Felicity HannahHOST
Are you seeing lots of pivoting and repositioning among the many companies that have previously been so dedicated to the automotive industry?
BONUS: Cancer, Estrogen and Detox: What Happens After Your Body Uses Estrogen
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11:20Amie HornamanHOST
Like why is it important? Why do we even care about something like NF Kappa B? And why do we care about s- sulforaphane? Like break it down for me.
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11:28David RobertsGUEST
Basically, you know, just to keep it simple, so y- you have estrogen metabolites.
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11:50David RobertsGUEST
And the reason it can is because of this enzyme that it releases in, it's NRF2.
11 MINS LATER
Estrogen Dominance Explained: What Every Woman on HRT Needs to Know
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16:57David RobertsGUEST
... um, and typically it's in the, in the, um, we t- we've been talking about it, uh, in the framework of microplastics with, uh, BPA, uh, microplastics being porous, BPA, um, basically being a plasticizer that makes the plastic softer and not brittle.
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17:18David RobertsGUEST
And, um, and so y- you know, each microplastic can have tens of thousands of different chemicals in them, like BPA.
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17:27David RobertsGUEST
But, um, but with BPA being an endocrine disruptor, you know, the, and a, and a estrogen mimic, basically, um, it can, um, if you th- if you think about it, it's, it's a s- you know, estrogen is a signaling molecule.
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17:45David RobertsGUEST
And, and so when it sends a signal, um, and you have, um, a mimicked estrogen s- also seemingly sending a signal, it's like I, uh, a analogy I make is it's like you're watching two TV shows on top of each other.
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18:01David RobertsGUEST
You may notice A character or you may be able to tell what shows you're-- they're, they are, but you're not gonna understand the plot.
Ep. 135 – Sulforaphane and Cancer Support: What Most Supplements Get Wrong
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4:49David RobertsGUEST
Yeah, basically in 2012, my late wife, Mara, was diagnosed with breast cancer and she wanted to treat it naturally.
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5:04David RobertsGUEST
We met my current business partner that first week, Dr. John Gilday, a researcher at the University of Virginia.
9 MINS LATER
S2 E5: Voices of Adventure - David Roberts | BANFF @Altitude Podcast
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52:54
53:05
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52:33Jeff PowderHOST
What's your experience in doing profiles? What's critical in writing about somebody else? I found I was

David RobertsGUEST
And the trick is to fall in love with your subject when you're interviewing him or her, and then to fall out of him or her when you're writing.

David RobertsGUEST
So even as I was interviewing, I would always try to dig for the thing that the person liked.

David RobertsGUEST
I don't mean I was a Snoopy expose writer, but I would try to catch all of their grandiose statements at the point where they maybe had a little flaw, sort of see if I could dig into that.
92: Could Chronic Inflammation Be the Missing Link? The Science Behind Sulforaphane, Detoxification, and Cellular Health with David Roberts & Dr. John Gildea
1:48

McCall McPhersonHOST
I would love for you to tell us a little bit about y- both of your journeys and what led to where you are today and the impact that you all are having.
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1:57David RobertsGUEST
Yeah, I mean, my journey started when my wife was diagnosed with breast cancer in 2012, and that very same week a mutual friend, uh, introduced me to John and his wife, uh, Heather.
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2:10David RobertsGUEST
And, and so for probably a, a span of about five years, I emailed or called John every day except Sunday and asked him questions about cancer, sort of, uh, 'cause he's sort of an expert.
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2:22David RobertsGUEST
But yeah, basically we were able to grow Mara cancer cells in our lab and put 60 different, uh, substances like supplements on them to see what directly killed her cancer cells.
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2:36David RobertsGUEST
And so sulforaphane, which is the good molecule from broccoli, was number three in directly killing her type of cancer.
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2:44David RobertsGUEST
And so, uh, of course, I went out to buy some, but all I could find was this precursor molecule called glucoraphanin.
17 MINS LATER
How Broccoli Can Reverse Aging & Detox Microplastics | Mara Labs Founders on Sulforaphane
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23:02David RobertsGUEST
Yeah, I mean, the Netflix just came out with, in March, a documentary on microplastics and fertility.
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23:15David RobertsGUEST
And so they have things called plasticizers, which makes the plastic less brittle.
43 MINS LATER
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66:29John GildayGUEST
It'd be a good test for someone to develop is just, you know, take whatever cells of blood drop, pellet the cells, wash it once with isosmotic so you get rid of the potassium magnesium that's outside the cell, lyse the cells, measure the internal.
We're Just Getting Started Understanding The Effects Of Micro Plastics With David Roberts
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6:50David RobertsGUEST
I think you're right, because, you know, it is silent and you don't you don't have you don't notice it until you have a problem.
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7:04David RobertsGUEST
regular menstruation and I'm like, have you basically thought about coming off of microplastics or decreasing your burden of microplastics? But it's typically not until you have a problem that you start thinking in those ways.
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7:21David RobertsGUEST
And it's because once microplastics gets inside of you, they get into your cells and they get engulfed in things called lysosomes, which are the digestive centers of the cell.
Eat 5 Pounds A Day of Broccoli OR Do *This* (+ Get Microplastics Out of Tissue Fast?!)
25:44

Ben GreenfieldHOST
So, so talk to me about kind of like the comparison between, you know, trying to get sulforaphane from glucoraphanin sources like broccoli or supplements versus figuring out a way to stabilize it and have it available in something like capsule form.
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26:02David RobertsGUEST
I mean, I think the, the main thing to... uh, there are a couple things to keep in mind.
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26:06David RobertsGUEST
First, that not every broccoli seed, uh, has glucoraphanin in it to produce sulforaphane.
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26:15David RobertsGUEST
I think ba- it's been about five years now that we, we were testing a bunch of sources, and we were shocked to find that not all of the sources that we were, uh, like in fact, most of the sources we were getting couldn't...
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26:29David RobertsGUEST
We were looking for organic brands and trying to, you know, figure out sourcing, uh, for seed and, and I think we got six, and five of the six or six of the seven couldn't make sulforaphane and didn't have glucoraphanin.
29 MINS LATER
How to Get Microplastics Out of Your Body | Mara Labs
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13:16David RobertsGUEST
It's amazing product, right? So sulfo- sulforaphane, we try to talk about, just focus on, you know, a handful of its benefits, but it has 39 pro-health benefits in the, in the science literature, and the, this, this detox pathways, glutathione, pha- it's the best natural molecule at in- inducing phase two detox because, uh, of the NRF2 pathway.
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13:39David RobertsGUEST
Um, and so yeah, it's, it's, it is a, an amazing supplement, not just because we sell it, but c- b- but because of what it is.
Benefit of the stout
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17:43David RobertsGUEST
Uh, well, it's a slightly bigger increase than, than the dollar one because the, uh, sterling rate has also gone against us.
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17:51David RobertsGUEST
So a-actually, aluminum's up over fifty percent in, uh, since the end of twenty twenty-four.
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18:04David RobertsGUEST
Uh, two big smelters in the Gulf, one in the UAE, one in Bahrain, have been attacked.
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18:09David RobertsGUEST
They've both said they're not gonna come onto full production for months, possibly a year.
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19:50Will BainHOST
Beyond cars, just give people some other areas g- 'cause I think that's interesting, isn't it, about where people might see sort of unexpected price rises, David.
The Broccoli Molecule That Steers Estrogen Down the Right Pathway | Mara Labs
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13:26David RobertsGUEST
I just wanna say, f- I think the most important thing to, to take from this podcast is that we, uh, so sulforaphane is, uh, infamously unstable, and so we have the only naturally stabilized form of it that's in a capsule that you can take.
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13:44David RobertsGUEST
It's five milligrams per capsule, which is roughly equivalent of two and a half pounds of mature broccoli.
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13:50David RobertsGUEST
Um, and so there, I, we have, we go to conferences, we have doctors come up to us every conference, "Well, what about this brand?" So, so, and they, it says on the back sulforaphane glucosinolate, which means sulforaphane p- precursor.
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14:05David RobertsGUEST
And so I'm like, "I'm sorry, that's not, so it doesn't have sulforaphane in it." It has the molecule that comes before sulforaphane, which is stable.
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14:12David RobertsGUEST
So if you have a head of broccoli, you start chewing it, the glucoraphanin, the precursor molecule's in there, you break the cell wall through this chewing, and it releases an enzyme that converts that glucoraphanin into sulforaphane.
49 MINS LATER
#425: Broccoli Power: The Secret Longevity Molecule (Fighting Toxins, Microplastics & Aging) | Sulforaphane Exposed With David Roberts & Dr. John Gildea
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18:57David RobertsGUEST
Um, I think I may have given him a couple Sundays off, but, um, just question after question, just he's a wealth of knowledge about cancer.
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19:05David RobertsGUEST
Um, and, you know, I have a science background, but, um, but John is so-- he's-- ha- was ten years ahead, um, in knowing what he knows and, and knowing, knowing what he knew.
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19:22David RobertsGUEST
I, I asked him, uh, we-- he actually grew Mara's cancer cells in our lab, um, and so, um, he-- and he basically determined that sulforaphane was number three in directly killing her type of cancer, and that was sort of, um...
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19:39David RobertsGUEST
I mean, we, we went out to source s- source it in supplements and real- realized really quickly that all the broccoli supplements on the market are the precursor molecule glucoraphanin.
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19:51David RobertsGUEST
Even though they... uh, most, most of them say they have sulforaphane, they do not.
54 MINS LATER
How to spend billions – fast: Carney’s Defence Deadline
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25:04David RobertsGUEST
What it's done is that the plans that we had to improve our operations, to increase the input of apprentices, for example, or to acquire tooling or spares that were being throttled back because of the financial restraints that we had in the past, now we're able to and proceed with those procurements.
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25:55David RobertsGUEST
Each one of them would be about the size of a person, and, uh, weight, it is, uh, over four or five hundred pounds, so quite an impressive evolution when they're replacing them.
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26:05David RobertsGUEST
They barely fit in the hatch that they're being brought on board through, and that is done using a, a crane, so obviously there's some limitations with wind and to make sure we do it safely.
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26:16David RobertsGUEST
And they're, uh-- Once on board, they're actually moved on teak boards using dish soap.
The Truth About Detoxing, Hidden Environmental Toxins, & Supporting Cell Longevity Ft. David Roberts & Dr. John Gildea Of Mara Labs
2:44
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Lauryn BosstickHOST
Uh, when you guys connected, what was the conversation like behind the scenes?
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2:53David RobertsGUEST
I still have a background in sciences, so I, I would read about different sup- supplements and cancer, and, um, I'd always like, "John, what do you know about this? Is this true? It's not true." That's actually how we, um, you know, found out about the-- I found out about the good molecule in broccoli called sulfor- sulforaphane, um, that, uh, basically, John actually, uh, grew Mora's cancer cells in his, in our lab, and we put sixty different supplements on them to see what killed her type of cancer, and the sulforaphane was number three in killing her type of cancer.
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3:32David RobertsGUEST
So went out to buy it, couldn't find it because it didn't exist, 'cause all the broccoli supplements on the market are the precursor molecule called glucoraphanin.
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3:40David RobertsGUEST
And so it was like, you know, we ended up just growing a lot of broccoli sprouts for years.
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3:47David RobertsGUEST
And, you-- at the time, I had a one- and three-year-old, uh, boys, and, um, you know, so you're, you're caring for them.
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3:53David RobertsGUEST
You're, I-- we were growing, like, enough broccoli sprouts for, like, the joke, it's like ten families because it was like an operation.
7 MINS LATER
Michael BosstickHOST
But are there certain things you guys have discovered that make somebody more, um, likely to get cancer compared to others?
#1220 Microplastics Are Wrecking Your Metabolism - The Shocking Detox Science You Need to Know with David Roberts and Dr. John Gildea
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5:20Ben AzadiHOST
What is it doing to our bodies, our metabolisms, and what can we do about it? So David, I'd love for you to share why this is a huge concern and a problem these days.
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5:30David RobertsGUEST
Yeah, I mean, I think part of the problem is that they're everywhere, right? And so even like an apple has a million microplastics on it.
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5:40David RobertsGUEST
Even glass bottled water, depending on the top, can have 100,000 bits of microplastics.
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5:56David RobertsGUEST
So the fact that you are ingesting, you know, quite a lot of microplastics daily, not I mean, if you microwave your food and, you know, get one of those microwavable dinners, you're There's a lot.
40 MINS LATER
J. Walter Sterling & David Roberts
6:28
13:26
Molly Jong-FastHOST
But data centers, we are just having to pay for Google using more electricity.
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6:34David RobertsGUEST
Well, there's a lot of people working right now, (laughs) and there's a lot of thinking going on.
D
6:39David RobertsGUEST
I mean, one of the sort of hot topics in my area of the world right now is how, because these data centers need to hook up to the grid.
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6:46David RobertsGUEST
If you build a data center and you're waiting to hook up to the grid, you are literally wasting millions of dollars a day in opportunity cost.
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6:54David RobertsGUEST
So these people desperately wanna hook up to the grid, but there's no room for them on the grid.
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6:59David RobertsGUEST
So how can we get them to pay for the reforms that would make room on the grid, right? How can we get them to pay for grid upgrades? Rather than us paying for them, how can we get a little money out of them to pay to upgrade our grid? And the amount of money, Molly, that is going into AI and data centers, you would need like 2 or 3% of that money, and you could transform the US (laughs) electricity system.
6 MINS LATER
Molly Jong-FastHOST
What about the sort of temperature damage, like the hydrocarbons, the microplastics in our brains? Like, what about the irreversible stuff?
David Roberts On The Major Setbacks To Climate Policy
12:10

Brock BenefielHOST
Whether that was through new policies or new pledges, like I mentioned, what do you like? I guess, broadly speaking, what do you think is possible or what could be possible in the wake of this bill?
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12:29David RobertsGUEST
It was like, I mean, it's just anybody who's lived through it knows this just strikingly different.
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12:40David RobertsGUEST
An anomaly, a weird one-off quirk that happened because a bunch of different things came together all at once in just the wrong way.
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12:50David RobertsGUEST
Timing was bad, so it was a little bit of like a fluke, and it inspired resistance.
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12:56David RobertsGUEST
And so it did inspire, actually, quite a bit of climate action at the state and city level.
14 MINS LATER



