The vitamins market is growing fast, with many companies now offering bespoke vitamin plans that claim to produce the perfect personalised prescription just for you.

Our listener Gareth wants to know if this could be a quick fix for his low energy and poor diet so Greg is going to find out. He’s got his sights on the popular companies suggesting personalised plans based on a simple online questionnaire that builds up a picture of your vitamin deficiencies via questions about your exercise, stress levels, diet and more.

But these personalise plans comes at a premium - some go for close to £25 per month. Greg tests the questionnaires, speaks with nutritional experts, and sees whether Gareth thinks personalised vitamin plans are the best thing since sliced bread, or marketing BS.

This season we’re testing YOUR suggested wonder-products. If you’ve seen an advert, trend or fad and want to know what the evidence says drop us an email to sliced.bread@bbc.co.uk or drop Greg a message direct on his social media where he’s @gregfoot

PRESENTER: Greg Foot PRODUCER: Simon Hoban