Why I Won’t Touch These Top-Selling Kitty Litters

Today I’m talking with Jonah, who develops biobased products. Biobased products are defined as materials, chemicals and energy derived from renewable biological resources. Jonah has spent a decade working on biobased products, and he’s especially passionate about products made with biochar.

Biochar is made from biomass, which is then turned into carbon. It’s a natural process that takes atmospheric carbon out of the environment and turns waste material into value-added products and consumer goods. Jonah has created a biochar cat litter we’re going to talk about and demonstrate today.

Many Types of Litter on the Market Today Aren’t Appealing to Cats

Jonah explains that typically, biochar is put into soil environments.
“Biochar is special,” says Jonah, “because it has a huge surface area and is a recalcitrant. That means the charcoal itself holds on to things. It holds on to nutrients. It holds on to water. It holds on to smells.
When we think about our furry family members, we want them to have clean spaces with low odors and natural-based products. That’s why biochar fits really nicely into cat litters.”
Jonah is definitely on the right track. Studies on the types of litter cats prefer show they are quite particular about particle size. The cat’s evolutionary substrate, for potty purposes, is sand. When kitties started living indoors, clay litter came along and most cats were okay with it. But clay has its own issues.

These days, there’s a wide selection of organic and natural types of litters on the market, but many of them feature big particle sizes, which don’t appeal to most cats. The danger in forcing an objectionable litter on cats is they often develop litterbox aversion, which can lead to other problems (e.g., eliminating outside the box).

Kitties also don’t like synthetic scents or odor control additives in their litter, and one of the wonderful benefits of Jonah’s biochar product is that it’s very effective at naturally controlling litterbox odor.
“It has a super-high surface area,” explains Jonah. “It controls odors and soaks up liquid. And over time, because it doesn’t contain any sugar-based ingredients, it actually controls biological growth as well.”

Biochar Kitty Litter Versus Two Top-Selling ‘Natural’ Litters

The litters we’re demonstrating today include our new product, Dr. Mercola’s Biochar Kitty Litter, plus two other top-selling litters in the natural category. One is made from corn, and the other from walnut.

My issue with corn-based litters is two-fold. Number one, 90 percent of the corn grown in the U.S. is genetically modified. Secondly, corn crops (and wheat as well) are treated with the herbicide glyphosate.

If a cat ingests a corn- or wheat-based litter, he’s ingesting chemical herbicides, starch, and potentially mold, including deadly aflatoxins. Jonah has actually demonstrated both in the lab and in product trials that there can be a profound amount of mold growth in corn-based cat litter.

In fact, any litter containing sugar-based ingredients has a much higher probability of producing mold and other types of potentially toxic growth than litter made from biochar, which contains no starch or sugar.

Jonah is going to run two tests here. One test is for clumping, which is a very important feature of cat litter. Clumping extends the life of the litter and provides a healthier environment for cats. We’re also going to test the quality of absorption, which is the ability of litter to soak up liquid.

For our clumping test, we’ll add 5 milliliters (ml) of liquid to each of the three litters to simulate cat urine, and we’ll let it sit for a minute. For the absorption test, we’ve put equal amounts of each of the three litters in three cups, and we’re adding 170 ml of water to each cup.

Biochar Litter Is More Absorbent and Produces Better Clumps

It’s obvious looking at the three litters that the biochar litter has achieved total absorption of the 170 ml of water. The other two products are soupy and messy by comparison.

“Just totally solid, maybe a drip, but totally solid-grade absorption,” is how Jonah describes the performance of his biochar litter. That means the product in the litterbox will last longer, and there will be less total wetness and mess.

And not only that, but the biochar litter is 100 percent biodegradable and compostable. And it’s entirely fragrance-free, because the carbon helps to lock in odors. I’ve tried it at my house, and believe me, it works! So the biochar litter passed the absorption test well ahead of the corn and walnut litters, and now we’re looking at the clump test results. The biochar litter has formed solid clumps that don’t break apart if they’re dropped.

Most cats like to keep their pee and poo clumps confined to one area of the litterbox, so the clumping ability of the biochar product is very helpful for keeping the rest of the litter clean. It also makes scooping the box a breeze.

The clumps produced by the other two litters are breaking apart very easily and making a mess. This means the whole box must be changed out frequently because there’s really no way to remove all the waste efficiently. Residual urine can be very offensive to sensitive cats and kitties with litterbox aversion.

Definitely one of the highlights for me when I tried out the biochar litter at my house was the natural odor control. Even when a cat poops in the box, as soon as she covers it with litter, the smell evaporates.
The strength of the clump has a lot to do with odor control over time,” explains Jonah. “The clump sort of turns the odor solid. When we smell stuff, it’s because it’s evaporating up into the air. If you have a liquid or a gas, it smells a lot stronger. If it clumps into a solid, the smell really gets knocked down. That’s why good clumping performance helps control odors.”
The same holds true for the strong ammonia smell produced by cat urine. The biochar product neutralizes it immediately. This is really great if you occasionally skip a day of scooping because your whole house doesn’t end up smelling like a litterbox!

Biochar Litter Is Entirely Non-Toxic for Cats and Environmentally Friendly

Jonah’s product is the first carbon-neutral cat litter. “There’s a lot of math about carbon neutrality, carbon negativity, and atmospheric carbon positivity,” says Jonah.
“What I like to say about it is we are a carbon-progressive company. We are a wood products company. We make biobased products out of wood products. Those materials come in, off of what’s called a stewardship contract. We’re very conscientious about how we harvest wood. Then we bring it in to process.
As part of that process, we make our biochar, and the idea is to use the photosynthesis that grew the plant to capture carbon from the atmosphere, then to turn into biochar, and in that process, lock that carbon into a solid form. Science tells us that solid form is not going to biodegrade on us. It’s the weight of the carbon, which photosynthesis captures, that we sequester by turning into a solid.
Of course, there’s a lot of carbon dynamics in the system. I think the best thing to say is we try as hard as possible to be a carbon-progressive company. Meaning, we’re trying to sequester carbon from the atmosphere. It’s important that we do a lot of math to make sure that we’re always taking strides in that direction.”
I think Jonah’s biochar kitty litter is a wonderful product, and in case anyone is wondering why it’s such a dark color, that’s the carbon in it.

I can tell you it definitely attracts cats. I was able to switch my kitties to it immediately. They went into the box with no problem, and I’m extremely happy with the performance of the litter. Knowing that Jonah is improving the environment with the product makes it that much more attractive to me.

It’s a litter than is entirely non-toxic for cats, and simultaneously beneficial for the environment. I’m really excited that Jonah has developed a cat litter for Mercola Healthy Pets that is all natural, non-toxic, and high-performing. It’s a win for everyone, including our kitty companions!

By Dr. Karen Becker


  1. I was excited about this product & immediately ordered 3 bags. I was very disappointed at how poor its clumping capability is. I need to spend many minutes hand-picking out
    little pee balls. The main clump has to be handled very carefully to keep it from crumbling. And then there’s the black dust everywhere! It may not be toxic, but I don’t like the idea of it coating the litter box & other surfaces around it, not to mention my cat licking it from his paws & coat.

    • I was excited about this product and thought, finally, I found a safe cat litter for my cats. By sadly, my excitement was short lived. The black dust was everywhere, I mean everywhere. My cat’s white paws were soot gray and the area around their litter boxes had this black dust everywhere. Even when I scooped the litter box, my fingers were dusted with this black dust and when I blew my nose, I saw black dust in the kleenex. I have a herpes cat and was very concerned about his health and the effects of breathing this dust and cleaning his paws would have on him and my female cat. I stopped using it after four days. Ever since I have used this my cats have both thrown up at least once a day. I don’t know if it is due to the litter dust that they breathed in and licked off their paws; but both have been healthy and Chase’s herpes has been very well controlled since we adopted him five years ago and Jasmine has been the picture of health during the nine years we have owned her. The other complaint I have is this litter is a tracking nightmare to say the least. As far as clumping capability, it was just okay. I had to spend several minutes combing through the entire litter box to pick up the broken up clumps. The only positive was excellent odor control, especially with poop odors.

      • Emmadel Jones says:

        I also thought I had found a cat litter that wasn’t full of chemicals, and would be safe for my cats and my family. It may be safe, but it will ruin your home. It’s very dusty, and the black dust went everywhere, the kitchen, the bathroom, the walls, even in our beds. The cat trees and our carpet turned black. It really doesn’t clump very well, and because it’s black you can’t see where the cat has used it, so you have to do a lot of stirring and digging to find the soiled litter. I looked in the mirror after a box cleaning and my teeth were black. But, the worst thing was after we stopped using this litter we had our carpets cleaned, and the black dust cannot be removed, it leaves a permanent stain on carpeting. The only thing we can do is rip up and replace the carpeting (at a cost of $10,000), or have a house that looks like dirty pigs live in it. I hope I can save someone else from this nightmare, please don’t even think about ordering this product.

  2. Thanks Susan and Lori for commenting on this product. I was just getting ready to order it . What did u end up going to.

  3. I was so disappointed to read these bad reviews. I thought I had finally found a natural, dust-free litter. I currently use Blue Buffalo walnut-based brand and it leaves brown dust over every surface in the room. Tracking isn’t too bad, and it clumps pretty well, but odor control isn’t great. I scoop twice a day.

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