Calm in a can. Relaxation after a few sips.

That's what some drinks companies are promising with beverages formulated specifically to help you chill out.

Lucy and Serena swear by them. They're good friends who, like many, are juggling careers, the chaos of having small children, trying to stay fit, and everything else in between.

"These drinks aren't going to get rid of all my worries and anxieties," Serena says, "but if they give me a little boost - then I'll take it."

Lucy finds them really useful too, especially when she's feeling a bit overwhelmed.

"If I get that low-level panic, then with a drink of Trip or something like it, I can bring it back round."

But after an advert by one of the industry's best-known brands was banned for suggesting its drinks helped with stress and anxiety, there have been questions about whether drinks of this kind are quite as effective as they make out.

BBC News has spoken to nutritionists and dietitians who are sceptical the small amounts of supplements the drinks contain could really bring about that sense of zen.

One psychologist has suggested that we might actually "create our own calm" when we set aside time for ourselves with something that feels like a treat.

The "functional beverage" market - that's drinks with additional health benefits - is booming, with British supermarkets seeing sales jump by 24.5% in the last 12 months, according to one market research firm. Almost 30% of UK households now buy these functional drinks, Worldpanel by Numerator says.

So, what's actually in them that's supposed to help........

© BBC