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Why Justin Theroux Is Sampling Jennifer Aniston's Shampoo

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Now that Jennifer Aniston is the face and co-owner of Living Proof hair products, she has everyone using them — even her fiancé, Justin Theroux.

“He kind of has no choice,” she jokes to PEOPLE. “It’s what’s in the shower right now. You know he’s a guy, he just goes for what’s in the shower. But yes, he’s used it.”

And if he’s anything like his betrothed, he’s loving the company’s shampoos and conditioners — and their philosophy. “They’re still eager and they’re growing, and that’s what’s sort of fun,” she shares of the Massachusetts-based brand. “They’re still trying to crack the nut.”

That’s in part why Aniston decided to join the team. “I’ve been known for hair for so long and … it just never felt right,” she says of previous endorsement offers. “It has to ring true to me, and feel good. That’s the thing that’s exciting to me [with ownership], to be able to have creative participation and get behind the product in a way that is actually knowing what’s happening as opposed to selling what’s happening.”

Aniston says she’s loyal to products that work, and isn’t easily influenced by the next big beauty thing. “Whether it’s an Aveeno face cream (fun fact: she uses hers as eye cream, too!) that I’ve been using for 15 years or a Neutrogena cleansing bar, there are things that if you use them and feel confident … you’re telling the truth to consumers.”

But her best beauty tip comes without a price tag: “Sleep,” she says, laughing. “Honestly. Hydration — drink a lot of water — and get your sleep.” For more with Aniston, pick up the latest issue of PEOPLE, on newsstands Friday.

–Reporting by Julie Jordan

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