This beauty YouTuber didn’t tell fans that her new product could get them pregnant

Beauty blogger Tati Westbook, widely known as GlamLifeGuru, announced the launch of her new line of $40 Halo Beauty supplements on Wednesday, and her fans are fucking furious — not least because one of the ingredients in them is widely known for decreasing the effectiveness of birth control pills.

The ingredient in question, saw palmetto, is listed on WebMD as an additive that is known for lowering estrogen levels and decreasing the effectiveness of oral contraceptives.

The online medical resource suggests using a backup form of contraception, like condoms, if you are using saw palmetto and oral contraceptives that contain estrogen at the same time.

Westbrook's fans spotted the chemical when she posted a list of Halo Beauty's ingredients on Instagram.

"Saw Palmetto WILL decrease the effectiveness of your contraceptive devices," said one commenter.

"I am shocked that you would include an ingredient that can affect hormones the way it's been shown to," added another.

Westbrook also claims that her supplements contain "Five anti-gray-fighting ingredients" and will improve all of your skin. She adds that results come within three weeks of beginning the supplement regimen, which involves taking two pills every morning.

"This works," she said in a video titled MY BRAND ANNOUNCEMENT … xo's. "100 percent, it is Tati-approved."

"I'm feeling like an asshole today," commented one of her fans. "You were the one beauty guru/influencer that I trusted. The one I'd rely on for certain purchases. Feeling like I've been trusting a liar this whole time."

Later in the video, Westbrook calls the pills "magic… but the kind of magic that isn’t just in your head — it actually does work, this is clinically proven to work."

Long-time fans, however, are skeptical about the product — and the price. "This feels like a pyramid scheme ad," said a fan.

And at $40 a bottle, with a one-month supply in each, many complained that the price point makes the pills unaffordable.

This week, Westbrook went on a Scnapchat rant in which she refuted scientific claims about the efficacy of Halo Beauty, rebuffed her "haters" and said she's disabled comments on the video announcing her product launch.

We've reached out to Westbrook for comment, but have yet to receive a response.

Related stories recommended by this writer:

● Benefit Cosmetics didn't reveal the real reason it recalled all its brow gel — a potentially deadly bacterial contamination

● Glossier and Drunk Elephant's Instagram beef is fucking hilarious

@k80way