What's the best repellent to use for families with younger kids?

Friend have recommended their must buy favourites, but now I just can't remember what they were. We're after something that is safe and not toxic.

We've also heard that taking vitimin B1 two weeks before you go prevents being bitten. Anyone tried? Is it safe for kids?

Just as a quick update, I wanted to recommend a range of Sun care products from new site Sunkiddy, (all available online). From Toddler Milk (SPF50) to brilliant insect repellents from Neem (anyone who has experienced a nit epidemic will recognise the name) and what's more the smell is only detectable by mosquitos. Apply to exposed areas, especially before bed.

It's like a pre-holiday one stop shop for family suncare, and wanted to let you all know about it, as I think it's well worth a visit. They also have a full list of ingrediants for each product.

I hope this helps