In a world of 20-step skincare routines, trending products and beauty fads and phases - it's difficult to know what actually stands the test of time.
However, Jennifer Aniston has seemingly cracked the beauty code and has revealed her secrets on why she never appears to age.
From Friends to Bruce Almighty, Aniston, 54, is one of the most-recognisable faces in Hollywood.
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The award-winning actor has a very impressive decades-long portfolio of work after starring in some of our favourite films ever.
However, one thing that fans seem to always notice is not just the consistency of Aniston's incredible acting performances - but the consistency of her looks with many baffled as to how the star never seems to age.
And, after being crowned ‘World’s Most Beautiful Woman of the Year' back in 2016 by People - it's fair that people were eager to get their hands on the actor's beauty regimes.
People have continuously flocked to the Marley & Me star's Instagram to gush over her incredibly glowing skin.
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One fan commented: "Incredible, skin is lit, you look beautiful."
"Absolutely stunning lady," another added, "you still look like you’re in your 20s."
The health queen herself, Gwyneth Paltrow, even flocked to praise Aniston's youthful visage: "Um, are we back in the 90s today??"
Well, it seems that there most definitely is a tip, or two, that Aniston has been kind enough to share with her adoring fans.
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Not so much of a secret and more of a friendly piece of guidance, the actor has long-since championed the natural beauty movement.
Alongside this, the Along Came Polly actor has outlined a strict policy of 'no-tox'.
"I believe in ‘no-tox," she told InStyle back in 2014.
"It absolutely distorts people's faces and you end up actually having the opposite effect.
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"You look older, in my opinion, when you can’t move and don’t let your natural expressions have their way."
The Break-Up star also spoke to Vogue about her number one trick she swears by to maintain her healthy complexion.
Drum roll please...
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Collagen supplements.
Aniston is now the face of Vital Proteins - brand that seeks to 'help people feel better and live fuller lives through high-quality nutrition products promoting natural beauty'.
Vouching for the impressive effects of Vital Proteins, the actor - who is also now the company's Chief Creative Officer - stated: "I don’t want to be the face of something if it’s not a part of my daily routine. That’s really important to me."
The official website breaks down Aniston's routine: "My go-to collagen routine is adding Vital Proteins Collagen Peptides in my morning cup of coffee or smoothie – so easy to use."
Noticing benefits in not just her skin, Aniston added: "My joints, my nails, my hair, my skin, everything just started to improve."
The star even picked up on a 'mental difference' after taking the collagen supplements.
Aniston added that ageing was far from a thing to be hidden or shunned and was to be celebrated instead.
She said: "It’s just sort of been a theme in my life: to enjoy the age I am and not look at ageing as a negative, but as the privilege that it is.
"We all age!"
Featured Image Credit: Pictorial Press Ltd / Everett Collection Inc / Alamy Stock PhotoTopics: Celebrity, Jennifer Aniston, Health, Beauty