Bubba Watson has agreed to partner cannabidiol product company, cbdMD, despite an initial PGA Tour warning to all golfers.
Watson, who will sport the company's logo on his headwear at the US PGA Championship, joins Champions Tour player Scott McCarron as the second player to sign an endorsement deal with a hemp manufacturing company.
Phil Mickelson was spotted using CBD oil at The Masters, and Tiger Woods has reportedly been using CBD gum.
CBD is a property extracted from cannabis or marijuana plants and according to those that regularly use the product claim it to reduce anxiety, inflammation, sleeplessness and chronic pain.
The PGA Tour this week reminded golfers in a memo that CB is "risky".
The PGA Tour report read: "CBD products (like all supplements) pose a risk to athletes because they have limited government regulation and may contain THC, the psychoactive component of cannabis that is prohibited.
"The FDA, DEA and private organisations including Major League Baseball (MLB) have conducted tests on CBD and 'THC-free' products only to find significant levels of psychoactive (and prohibited) THC or falsely labeled amounts of CBD.
"Taking a poorly labeled supplement that is contaminated with a prohibited substance is NOT a defence to a vioation of the Program. Therefore, we strongly recommend that if players choose to use supplements, they only use those that are NSF Certified for Sport."
CBD does not contain THC, however, which makes it legal by PGA Tour standards, and Watson believes the partnership between he and cbdMD is a "no brainer".
"I see Phil Mickelson winning at 48, so I've got at least eight more years of having a shot of winning some tournaments," Watson told CNN.
"So for me it was about how I create longevity in the game of golf and spending time with my kids running around.
"CBD was easily a fit for me. I've had doctors involved to do my research and see what companies out there make a product that's safe for me and safe for my family. It was a no brainer.
"There's no bad stuff in it, there are no chemicals in there that will mess you up or make you fail a drugs test. There are certain companies we trust."