Key to preventing wrinkles may be in your fridge - but beware of the smell

In the world of skincare, we've seen everything. From simple moisturising lotions, to salmon sperm facials - there's a plethora of and wonderful beauty products to choose from.

But now, it's been claimed that one surprising vegetable could be another secret weapon against ageing - especially among over-30s. Remarkably, the kitchen staple in question is actually the onion, thanks to its impressive vitamin C and sulphur content.

Sulphur, responsible for an onion's pungent smell, has the potential to enhance our - a protein that's especially abundant in our skin, according to . However, beyond the age of 30, our natural collagen levels start depleting, giving rise to wrinkles and fine lines.

explains: "As a good source of vitamin C, onions may support the building and maintenance of . Collagen provides structure to skin and hair."

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experts also suggest that copper, manganese and zinc are three other game-changing chemicals that may enhance collagen production. Pumpkin and broccoli are among the foods especially praised for this.

Various recommend collagen-based beauty products to combat wrinkles too - but picking the right one can make all the difference. Collagen itself, is a large molecule that cannot penetrate the skin's surface layer unless it's in the form of 'hydrolysed collagen'.

This consists of much smaller fragments that tackle visible signs of ageing from the outside, but still can't get very deep when part of creams and masks. Darcy Laceby, the co-founder of , previously explained: "Don't waste your money on buying collagen masks, creams and serums as the only benefit you'll get from applying collagen directly to your skin is very minimal hydration.

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"The only face masks, creams and serums that effectively work are pro-collagen products or ones containing collagen-boosting peptides that support collagen production." Instead, Darcy recommends bolstering your collagen levels by taking supplements.

These are absorbed more quickly into the bloodstream, effectively tackling signs of ageing from within, while also bolstering nail health. Other research even suggests it may improve too, though the extent is still uncertain.

Darcy stressed: "So, remember, you do not need collagen as an ingredient in your skincare routine, only in your supplement routine."