From haute cuisine to high end skincare, the humble snail is blazing a trail in anti-aging products, but do the claims about it stack up? Dr Zara Kassam PhD finds out. The idea of letting a snail slide across your face isn’t really appealing, especially when the particular variety we’re talking about isn’t the one you’d find gracing the tables of fine dining establishments slathered in garlic butter and washed down with a bit of Savingnon Blanc. Instead it’s the common garden mollusc that’s creating a stir in the skincare world – and if you believe the hype, it could turn back…