Dietitian Reema Patel is concerned the amount of supplement in these drinks may not give consumers the emotional balance, feelings of calm, or stress relief that is advertised across the industry. She highlights a growing body of evidence around the funghi Lion's Mane, but says there are no conclusive findings about whether it can have any impact - as yet.
"The research is still very much in its infancy," she says. "In one of the more advanced clinical trials, a small number of participants were given 1800mg - that's at least four times more than what is in some of these drinks."
Studies suggest women are more likely to consume these kinds of supplements, but they're not always front and centre in the research.
The lack of research that includes female participants is partly down to menstrual cycles and fluctuating hormones, making it more "complicated to track", Ms Patel explains.
But these drinks can make a good alternative to drinking alcohol she says, and she has clients who have made the switch from having a wine or a gin and tonic every night to opening a can of one of these drinks to help them unwind.
"I think you can take a lot of the claims with a pinch of salt, but they are definitely giving people that other option."
