Kate Middleton swears by this natural alternative to botox. Here's what you need to know.

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When it comes to skincare, money is no object for the royal family.

Therefore it was no surprise to hear that according to The Sun, Kate Middleton’s go-to product is a $109 wrinkle-smoothing Supreme Skin Gel, by the German brand Biolutin.

Although it promises to be a natural alternative to botox, unlike the injection-based treatment, it’s just massaged into the skin, like any other skin cream, lotion or gel.

Kate Middleton’s style before and after becoming a royal:

While the product definitely enters into ‘spendy’ territory, the 37-year-old royal loves it so much she’s also made former First Lady, Michelle Obama, into a fan, according to Michelle’s makeup artist, Carl Ray.

“Michelle Obama has been using this organic Botox gel regularly on the recommendation of Kate Middleton,” he told the Zoe Report.

Biotulin's Supreme Skin Gel utilises three active ingredients to achieve its promised results. Its plant-based components imperata cylindrica extract and spilanthol work to relax facial muscles (similar to botox), while the hyaluronic acid moisturises and plumps the face to increase the skin's radiance and glow.

However, unlike its needle-based counterpart, it's apparently safe for pregnant women to use and the gel is said to reduce the depth of lines by up to 25 per cent an hour after application.

Despite this, a prominent facial aesthetic specialist, Dr Maryam Zamani, has publicly questioned the product's claims.

Speaking to Get the Gloss, she says unlike botox which stops wrinkles by blocking the muscle's neurotransmission for up to three to six months, Biotulin only stops the muscle movement temporarily, but more importantly she says the issue of product safety should also be taken into consideration.

"There are several drawbacks to note, however. It has not had any long-term studies on safety and efficacy as it is a cosmeceutical, and there have been no peer reviewed scientific evidence to substantiate its claims," she explains.

"It is not classified as a drug or FDA approved and therefore has not gone through the safety measures that should be put into place for all so-called active products."

So miracle cure, or too good to be true? At $109 a bottle, at this point we'll just have to take Michelle Obama and Kate Middleton's word for it.

Have you heard of Biotulin? Would you try the product? Tell us in a comment below.