Hailey Bieber enlisted the services of a "skin care advisory board" for her brand Rhode.
Hailey Bieber has launched her own skincare range
The 25-year-old beauty spent two years working on her first three products, Peptide Glazing Fluid - a hydrating serum-gel - Barrier Restore Cream and Peptide Lip Treatment, and though she wanted to keep things simple with an uncomplicated ingredients list, she brought in scientific experts to help create the perfect formulas.
She told Allure: "Obviously, I can totally admit that I don't know what I don't know — so I had the idea to bring in a skin care advisory board.
"We brought in a dermatologist, we consulted with a cosmetic chemist… I had conversations with a lot of people that are very influential and knowledgeable in the skin-care space. And that was really how we brought these formulas to life in the labs."
But Hailey was quick to stress she was still heavily involved.
She said: "No decision has been made without me. I was the one who was going to the labs and explaining how I wanted it to feel and the results I wanted it to deliver."
And the model believes being "extremely picky" has paid off and she's confident about the collection.
She said: "If there was something that was even the teeniest bit off, I wasn't going to approve it because I don't want to bulls*** with this brand.
"I don't want to cut corners. I want amazing formulas. I want to give people amazing products."
At the top of Hailey's ingredient list was niacinamine, a form of Vitamin B which helps prevent inflamation and UV damage, minimise the appearance of pores and strengthen the skin's barrier.
She said: "One of my favorite skin-care ingredients of all time is niacinamide.
"I saw such a big difference in my skin with niacinamide, and I have very sensitive skin."
Peptides - strings of amino acids which help boost collagen production - also feature in all three products, as do squalane, glycerin and hyaluronic acid.