Attendees at The Row’s Paris Fashion Week presentation were treated to more than just the brand’s signature minimalist designs.

Straying from traditional post-show refreshments, the founders, Mary-Kate and Ashley Olsen, offered guests bottles of water with a twist—this wasn’t your typical bottled water.

Known as Litewater, this “deuterium-depleted” product comes with a hefty price tag of $225 per pack. It’s touted as a miracle drink, boasting benefits that range from enhanced mental clarity to disease prevention.

The creators of Litewater even claim it to be “the easiest, most powerful anti-aging strategy that exists.”

The question remains: are these claims credible? To explore this, The Post consulted Dr. Nate Wood, a primary care physician, trained chef, and Yale School of Medicine’s director of culinary medicine, for his expert perspective.

What is deuterium-depleted water?

Deuterium is a stable isotope of hydrogen — basically, a heavier version of the hydrogen atom, thanks to an extra neutron in its nucleus.

It naturally exists in water, but high-end brands like Litewater use a special filtration process to strip much of it out, creating what’s known as deuterium-depleted water, or DDW.

When you drink DDW, it slowly swaps out regular water in your body for water with less deuterium. Over time, the “heavier” water is flushed out, lowering deuterium levels in your tissues and cells.

Supporters say this shift unlocks a range of health benefits — but not everyone in the scientific community is sold on the idea.

What are the supposed benefits of DDW?

According to Litewater, when deuterium levels in the body get too high, your cells’ ability to filter out these so-called “heavy hydrogens” becomes compromised.

Over time, this buildup can allegedly disrupt cellular metabolism and mitochondrial function — leading to fatigue, accelerated aging and a higher risk of chronic disease and cancer.

By reducing deuterium through DDW, Litewater claims you can boost energy, improve cognition, optimize mitochondrial function and support healthier aging from the inside out.

“With every drop I drink of deuterium-depleted water I get lighter and more vibrant,” wellness consultant and Litewater partner Tracy Duhs wrote on Instagram. “My cells are more optimized. I’m practically floating away.”

Litewater has the lowest concentration of deuterium compared to all other drinking water, which the company said makes it “the purest water in the world.”

Fans even call it “the ultimate form of biohacking.”

“As you get older, people are just slowing down … But I don’t do that. I don’t feel that way. I really feel like in the teenage level of energy,” Robert Slovak, the 80-year-old co-founder of Litewater, said in a video. 

“I attribute it to a number of things, certainly deuterium-depleted water and my consumption of it is perhaps the crowning glory of my experience. I never felt this way before I took it.”

But is it really worth your money?

To reap the benefits Litewater promises, the company recommends drinking two or more cases per month — which would cost you around $400, at minimum.

They sell four-packs of 1 L. bottles for $400, 10-packs of 2 L bottles for $180, and 12-packs of .5 L bottles for $225.

“Even if I were incredibly wealthy and price did not matter to me, I would still not purchase this water for myself or my loved ones,” Wood said. “It’s a ‘wellness’ hoax. Don’t fall for it!”

Most studies on deuterium intake, he explained, have been conducted on animals or cells in a lab.

“In the studies that have been done in humans, no lasting negative impacts have been observed,” Wood added.

In fact, he said scientists still don’t know how much deuterium would need to be consumed to cause any harm — or if it would even happen at all.

“What we do know is that drinking a large amount of deuterium is safe,” Wood said. “For instance, studies have previously had people drink the equivalent of 70 mL of pure deuterated water per day for 7 or more weeks. There was no evidence of toxicity in these studies.”

For comparison, normal drinking water contains about 0.015 grams of deuterated water per 100 mL.

“So, in order to consume the equivalent amount of deuterated water that the participants in these studies drank, we would need to consume nearly 125 gallons of regular drinking water per day,” Wood said. “That would kill us for other reasons!”

“There is no proven benefit to drinking deuterium-depleted water,” he added.

The most expensive water money can buy

Despite its sky-high price and questionable health claims, Litewater isn’t even the most expensive bottled water on the market.

Acqua di Cristallo Tributo a Modigliani holds the crown, with a single 750ml bottle selling for $60,000 at a 2010 auction.

Its bottle is coated in 24-karat gold, and the water inside is a blend of natural spring water from Fiji and France as well as Iceland’s glaciers.

Svalbarði from Norway calls its product “fine water,” boasting: “With no nitrates or pollutants the ultra low-minerality makes for a light mouthfeel, with a slight bite and sweetness. Svalbarði is an experience for the palate, much like a fine wine.”

One bottle will set you back €99.95 ($116.79) — while a special collector’s edition bottle will set you back €6,000 ($7011.18).

Kona Nigari Water also boasts a high price tag, going for $402 per 750ml bottle. Sourced from deep ocean currents near the coast of Hawaii, it’s said to hydrate twice as fast as spring water or sports drinks.

Fans also claim it helps with weight loss, boosts energy and improves skin quality.

Then there’s the brand Nevas, which treats its sparkling water like wine. A 1.5 L bottle goes for about $100, while a magnum is nearly twice that.

And the high-end Los Angeles grocery store Erewhon — known for its eye-watering prices — sells a $13.99 bottle of Ophora Hyper Oxygenated Water. The brand says their drinks use 14 levels of filtration to “remove carcinogenic and other damaging chemicals from source water.” It’s then infused with a higher concentration of dissolved oxygen than what is typically found in regular water.