Quit your bellyaching — one CEO promises that fixing a single part of your body is the “secret sauce to everything” that ails you.

There are countless high-end gadgets on the market that biohackers swear can optimize your body to live healthier for longer, but according to Katie Wilson, the “ultimate biohack” is way cheaper — and tastier.

And she has a bunch of celebrities on board, including Bethenny Frankel, Scott Disick, Taylor Frankie Paul, Caitlin Jenner and JoJo Siwa.

4 A CEO says the “ultimate biohack” is getting enough fiber, which can impact your overall health. sorapop – stock.adobe.com

Constipated? Bloated? Tired? Irritable? Look no further than your digestive system.

“Honestly, gut health is the secret sauce to everything,” Wilson, the CEO and co-founder of BelliWelli, told The Post.

“It’s not just about digestion — your gut impacts your skin, your immune system, how energized you feel, even your mood. It’s literally the foundation of total health, wellness, and even beauty.”

Studies have even found links between the gut and Parkinson’s, colon cancer, and other conditions, with doctors routinely recommending people get more fiber in their diets.

That’s because fiber doesn’t just keep things moving down there — though it certainly does help keep bathroom habits regular. It can also help manage your weight, lower your risk of diabetes and heart disease, and just generally contribute to a longer life.

“You thought fiber was just something that cured constipation, but it’s actually one of the most powerful tools we have for our long-term health,” Wilson explained.

4 “Honestly, gut health is the secret sauce to everything,” BelliWelli CEO Katie Wilson told The Post. BelliWelli

“There are many forgotten benefits of fiber. Fiber is a foundational nutrient that supports immunity, energy and mood, and it’s even been linked to lowering the risk of heart disease, diabetes and even some cancers.

“Most people have no idea that fiber can play a key role in helping your body manage everything from blood sugar to stress.”

She points to “real science” that connects fiber to a longer, healthier life, calling it “the ultimate biohack.”

Her brand’s fiber supplement powder comes in a bunch of flavors — including watermelon, strawberry lemonade and peach mango — and contains 3.5g of dietary fiber per serving.

It’s also combined with probiotics, collagen and electrolytes, making it an “everything scoop” to double down on gut health, promote healthy skin and hair, and help with hydration.

4 While fiber can help keep things regular, it’s also been linked to lower cancer risk and other health benefits. New Africa – stock.adobe.com

“We wanted to sneak in all of the good stuff you know you should be taking. It’s like Liquid IV, Vital Proteins and Seed had a baby,” she said.

Wilson had made it the brand’s mission to bring “a new generation to the fiber aisle” — in other words, they say, this isn’t your grandma’s fiber supplement.

To that end, they’ve enlisted a lengthy roster of reality TV show and social media stars for viral videos on TikTok and Instagram. The packaging is also colorful and shiny: Wilson wants it to “proudly sit next to your other beauty products” on your counter.

4 BelliWelli’s fiber supplement powder comes in a bunch of flavors. It’s also combined with probiotics, collagen and electrolytes BelliWelli

And the key, she says, is not just to use it when you’re backed up.

“We want you to scoop your fiber just like you do your protein — not just when you feel a digestive issue coming on,” she said, encouraging people to “add scoops to your Stanley all day long.”

In addition to a supplement, experts recommend adding more fiber to your diet. Speaking to The Post, Stephanie Schiff, a registered dietitian nutritionist at Northwell’s Huntington Hospital, previously shared five food groups to choose.