Reality TV star and mother of three Kristin Cavallari has been making waves in recent weeks while promoting her new book Balancing in Heels. Just last week she shared an image of herself pumping milk backstage during her book tour. However, she’s now under fire for what she does once the breast pumping days are over.

I am loving everyone’s pictures!! So glad u guys are enjoying the book ????LA, I’ll be at The Grove Barnes & Noble this Monday night!! ????: @monogramsandmoscato

A photo posted by Kristin Cavallari (@kristincavallari) on Mar 17, 2016 at 6:06am PDT

Cavallari, 29, has spoken openly about only being able to manage breastfeeding for six months before switching to the bottle. But in a recent interview with People magazine, she explained her concerns around processed formula, and presented an alternative, homemade goats milk recipe she gives her children. In the article, she said that glucose syrup solids, an ingredient found in most formulas, were a serious concern for her and her husband, Jay Cutler.

Therefore, the couple consulted their pediatrician to develop a ‘natural’ formula for their kids. The alternative formula is made from goat’s milk, cod liver oil, and other organic ingredients.

So nice to be home in the middle of my #BookTour with my babies #BalancinginHeels **earrings @emeraldduvjewelry for those of u asking…???? A photo posted by Kristin Cavallari (@kristincavallari) on Mar 19, 2016 at 2:50pm PDT

But People magazine were inundated with complaints from readers who said that the current body of research shows goat’s milk to be dangerous for infants. Introducing goat’s milk to children under 12 months old can cause mild to severe health consequences, with some children having serious, life-threatening reactions.

Cavallari has previously defended her choice of goat’s milk for her kids. “Goat’s milk is the closest thing out there to human breast milk. Plus, it is more easily digested than cow’s or soy milk. Giving goat’s milk to children is popular in Europe and other parts of the world,” she said.

It’s a good thing Saylor is a rockstar traveler because she’s coming on the #BalancingInHeels #BookTour ! 2 weeks from today!! To order shop link in bio ????

A photo posted by Kristin Cavallari (@kristincavallari) on Mar 1, 2016 at 7:43am PST

But the fact that goat’s milk might be the right choice for Cavallari’s kids, four-month-old Saylor James, 22-month-old Jaxon Wyatt, and four-year-old Camden Jack, doesn’t mean it’s the appropriate choice for all infants. In response to the volume of complaints they received, People magazine have removed Cavallari’s interview.

Cavallari is the most recent in a string of celebrities who endorse alternative products, without sufficient scientific evidence to support them. It’s a dangerous trend, given the influence of these well-known voices. But it’s important for us all to remember that anecdotal evidence simply isn’t good enough when it comes to making important health decisions. And the claim that a product is ‘natural’ or ‘organic’ doesn’t necessarily mean it’s safe.

While stars like Kristin Cavallari appear to have all the answers on the surface, it’s important that we trust professionals, rather than celebrities, in matters of health.