Drinks that make you chill - do they really do what it says on the tin?

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 you feel more mellow or give your health a boost? Well, that's where things can get complicated, as each brand takes a different approach.

Along with Trip's Mindful Blend, other companies like Rheal, Grass&Co, Goodrays and supermarket own-brands, advertise that their drinks contain supplements including:

• Lion's Mane extract – a type of mushroom found in east Asian countries
• L-theanine – an amino acid found primarily in green and black tea
• Ashwagandha – a herb cultivated in areas of Asia, Africa, and Europe
• Magnesium – a mineral the human body needs to function properly

These supplements are all commonly found in many health and wellbeing products and are associated with enhancing mood, boosting energy, supporting cognition, and helping with stress.

But how robust is the evidence for that? It's tricky because there are many studies of varying credibility each suggesting different levels of efficacy.

Trip's advert, which suggested its ingredients were stress and anxiety busters, breached the Advertising Standards Agency's (ASA) code, with the ASA ruling that Trip's claims their drinks could "prevent, treat or cure disease" were a step too far.

Trip told BBC News the ruling related to "a single page on the website" and it has made the "changes requested". It says it's confident its ingredients permit the use of the word "calm" which is "widely and lawfully used by many brands".