Finn Russell uses it to help him sleep. Jerome Kaino takes some to ease knee pain. While Jim Hamilton needs it to cope with the aches he still lives with five years after retiring.
Cannabidiol, or CBD, is relied on by the British and Irish Lions fly-half, the two-time All Black World Cup winner, and the former Scotland lock - among many others - to manage the pain inflicted by the brutality of the sport.
But what is it? How does it work? And is it safe? In the first of a two-part series, BBC Scotland examines the role of the cannabis extract in rugby.
Rugby is one of the most physically demanding sports there is. And, with players getting bigger and stronger all the time, the pressure on their bodies continues to grow, particularly in a crowded calendar.
Strength and conditioning, nutrition, and sleep are the main methods of recovery. But often that's not enough, so players turn to painkillers ranging from common anti-inflammatory tablets, to powerful opioids such as tramadol.
Kaino, who won the World Cup with New Zealand in 2011 and 2015 and is known for his thumping tackles, "always" used anti-inflammatories to back up training sessions and matches.
"You'd be surprised at the numbers of players that do resort to those or the odd stronger painkiller to try to get rid of a few bumps and bruises," the 38-year-old tells BBC Scotland.
"I had a huge reaction to anti-inflammatories. I'd always have gut problems but to be able to get the joints feeling right I had to be able to take them every now and then."
Former Scotland and Saracens second-row Hamilton still lives with pain years after retiring. He too, has suffered from the adverse effects of painkillers.
"I lived on them," he says. "Especially at the back end of my career, I was taking anti-inflammatories daily. Almost like a course of vitamins just to get through the week. And because of that I still carry around gut pain."
Hamilton says he witnessed team-mates become addicted to opioids, given how easily accessible they were.
The culture in rugby has changed in the last five years, and it is much harder for players to get hold of those stronger substances, but the pain inflicted by the sport remains, which leaves players searching for alternatives.
CBD oil has proven to be one of the most popular.
Scotland and Racing 92 fly-half Finn Russell is a user and advocate for CBD. He has invested in a company selling the product founded by his former Glasgow team-mates Adam Ashe and Grayson Hart.
Russell takes CBD oil before he goes to bed at night, and sometimes when he wakes up, particularly in the days after a game. One of the main benefits he describes is a better sleep.
"I sleep the whole night rather than stop-start," the 28-year-old tells BBC Scotland. "I get a more stable and consistent sleep.
"It'll be different for everyone. It doesn't kill the pain there and then but it allows me to get a good night's sleep so the next day I'm feeling a lot better."
Hamilton and Kaino - neither of whom have a business interest in CBD - have noticed a similar improvement in their sleep, but also other effects.
"If I have a big training session, I get a lot of inflammation and a bit of fluid build up in the knees - that's where I've seen the biggest improvement," says Kaino.
The back-row also credits the product with prolonging his career, having recently won the Champions Cup with Toulouse at the age of 38 despite playing in one of the most physically demanding positions on the pitch.
"The last few years I've had a few operations and niggling injuries in the knees, elbows, and shoulders. CBD has 100% had a huge impact and input in being able to maintain my level of playing the last couple of years."
Liverpool John Moores University did a study last year in which 517 professional rugby players were asked about CBD use. The majority had never used it, but a quarter had at some point, and 8% continued to do so.
Professor Graeme Close worked on the study and is also an advisor to the England team. He says the biggest concern is a lack of education around the risks of an anti-doping breach, despite CBD itself not being on Wada's banned list.
Just under three quarters of those using CBD products said they got information about them from the internet, with 61% getting advice from another team-mate and 16% consulting a nutritionist.
"The fact players aren't getting qualified advice is worrying," Professor Close explains. "Being quite a new product, we're still not fully aware of the safety profile of CBD. There really aren't any long-term studies."
These concerns are reflected in the stance taken by most rugby unions and clubs.
Players employed by Scottish Rugby are banned from promoting CBD products and are encouraged to assess the risks and need to take them, along with any other supplement they might consider using.
Some companies providing CBD products have their offerings tested by three different labs across Europe in order to ensure there is no THC. And while small amounts of it are permitted, other cannabinoids are not.external-link
"In the hemp plant there's well over 100 cannabinoids," says Professor Close. "Only one of them isn't prohibited by Wada and all the others are.
"So if an athlete is taking CBD, we need to know that they're taking it from a source where we know there are no other cannabinoids in there that would fail an anti-doping test."
The company Informed Sport tests supplements and is commonly considered as the gold standard for products in the UK, but they currently do not accept CBD products. It remains to be convinced of its safety from a doping perspective.
But the industry is predicted to be worth $20bn (14bn) by 2024, and athletes across sports continue to use, promote and invest in CBD products.
"When I was younger, instead of taking drugs I would go down the herbal route," Russell says. "So it's similar to that. I've had that my whole life and it's just another level of it for me in the current stage of my career.
"It's come from a plant so what's to say it's any different from other things that you get? It's up to the individual what they want to do, but for me I've got no concerns about taking it and I'll continue taking it."
Could CBD become 'like protein shakes'? Find out more in part two on Thursday
Read the original post:
CBD and rugby: Why are the sport's biggest names turning to cannabis products? - BBC Sport
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