The beauty industry has never been short on promises.

Glowing skin. Better hydration. Fewer fine lines. More elasticity. Stronger hair and nails.

But when almost every ingredient seems to come with a long list of benefits, it can be difficult to separate what sounds good from what actually has research behind it.

So, what does the science say?

Here are some of the most talked-about nutrients and supplements for skin health — and what the evidence actually tells us.

Collagen: probably the biggest name in beauty supplements

Collagen is one of the main structural proteins in our skin, helping provide its strength and elasticity. As we age, changes in collagen production and breakdown contribute to some of the visible signs we associate with ageing.

That has made collagen peptides one of the most popular beauty supplements in the world.

And unlike plenty of wellness trends, there is clinical research behind them.

A 2023 systematic review and meta-analysis looked at 26 randomized controlled trials involving more than 1,700 participants. Researchers found that hydrolyzed collagen supplementation was associated with improvements in both skin hydration and elasticity compared with placebo.

More recent research has continued to find promising results, although researchers have also highlighted important limitations, including differences between studies, relatively short follow-up periods and frequent industry involvement.

In other words: collagen isn't magic, but there's considerably more evidence behind it than the hype alone might suggest.

And consistency appears to matter. Research suggests that some benefits may become more apparent after taking collagen consistently for a number of weeks rather than simply taking a larger dose.

Vitamin C: your skin actually needs it

Vitamin C has been associated with skincare for years, and for good reason.

Your body needs vitamin C for normal collagen synthesis. Skin also naturally contains relatively high concentrations of vitamin C, where it plays roles in collagen formation and antioxidant protection.

That doesn't mean taking enormous amounts of vitamin C will suddenly transform your skin. More isn't automatically better.

But getting enough vitamin C is part of giving your body the nutritional building blocks it needs to maintain normal skin.

Think less "miracle beauty ingredient" and more "important part of the machinery."

Hyaluronic acid: not just something you put on your face

You've probably seen hyaluronic acid written across countless bottles in the skincare aisle.

It's naturally found in the body and is particularly well known for its ability to bind water, which is why it has become such a popular ingredient in topical skincare.

But researchers have also been studying what happens when hyaluronic acid is consumed orally.

Recent randomized controlled trials have found promising results around skin hydration, elasticity and wrinkle depth.

It's still an emerging area of research, so we'd stop short of calling oral hyaluronic acid a miracle ingredient.

But it's certainly one worth watching.

Biotin: where the marketing gets ahead of the evidence

Now for one of the biggest names on the supplement shelf.

Biotin.

Biotin is an essential B vitamin, and genuine biotin deficiency can cause symptoms including hair loss and skin problems.

That's an important distinction, though.

Biotin's reputation as a universal shortcut to better hair, skin and nails is considerably bigger than the evidence supporting supplementation in otherwise healthy people.

That doesn't make biotin useless. It means context matters.

Correcting a deficiency and taking more of something when you already have enough are two very different things.

So, what's the real secret to better skin?

Unfortunately, there isn't one.

Skin health is influenced by everything from age and genetics to nutrition, sun exposure, smoking, sleep and your skincare routine.

No single capsule, powder or serum can override all of that.

But that doesn't mean supplements can't have a role.

The more interesting question isn't:

"What supplement will give me perfect skin?"

It's:

"Which ingredients actually have evidence that they can support healthy skin as part of a good overall routine?"

And that's where the research becomes much more useful.

Collagen has a growing body of clinical evidence around hydration and elasticity. Vitamin C has an established biological role in normal collagen formation. Oral hyaluronic acid has promising emerging research. And ingredients like biotin are a good reminder that popularity isn't always the same thing as proof.

The best approach isn't chasing every new beauty trend.

It's understanding what you're taking, knowing why you're taking it, and being consistent enough to give it a chance to work.

Supporting your hair, skin and nails from within

That’s also the thinking behind MOJO Hair, Skin & Nails.

Rather than treating beauty as something that only happens on the surface, it’s designed to complement your everyday routine by providing nutritional support from within.

Because great skin isn’t about finding one miracle ingredient. It’s about building a routine you can actually stick to.