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About Four Oaks Farm

Four Oaks Farm Products

Founder, Creator, and CEO


VP, Marketing, & Operations Manager

The Natural Release Story

Products that you find on the drugstore shelves don’t often have their origin story begin with a company that for many years, only made equine and animal health products. Natural Release Muscle and Joint is an exception.

Natural Release was originally created in 2014 for horses. All our products are created and tested for years at Four Oaks Farm Sport Horse Rehabilitation and Recovery Centre in Simi Valley, CA. Four Oaks is the facility where sport horses are sent to recover from injuries incurred in the arena. When they leave here, they go home and get back to work.

So here is what happened. People started buying Natural Release at the farm stores. It should be noted that we horse people are a peculiar breed. We will always try out a product on ourselves first, making sure it is up to par for our animals. If it works on us, only then will we trust that it will work on our animals.

Thousands of people did this. They discovered it worked wonders on their own muscle and joint pain, strains and sprains, even inflammation. They ended up buying a bottle for the barn, and one for the house. Then along came Christmas time each year and they would buy a bottle for aunt Sally and Grandma and cousin Jim.

In theory, that’s great right? The problem started when horse people gifted a bottle to non-horse people. Non-horse Cousin Jim would call and say, “Hey, Chuck, why’d you send me horse stuff??” Then the whole “It’s okay, I know it’s for horses but it will work on your bad shoulder” conversation had ensue.

We at Four Oaks decided we needed to give the non-horse people their own bottle labeled specifically for humans so we could avoid all the explanations.


(NOTE: I know you are here to buy the Human version, but you may find the whole story interesting.)

Our Four Oaks Farm facility hosts between 50-70 sport horses on any given day. Each day horses come and go. The new ones arrive with every possible injury. Working side by side with the top vets on the west coast, it is our job to rehab the injury, slowly move the horse into a reconditioning program, and finally, when they leave us, they are ready to get back to full training.

When you care for so many injuries, of course you have a tack room brimming with every conceivable animal health product. We have tried them all. Many work great. Unfortunately, often there is that horse that just NOTHING works. All horse owners can relate – and frankly all people can relate. There is always that tweaked shoulder or funky knee that you simply can’t make feel better. You have tried everything and spent hundreds, maybe thousands of dollars on creams, sprays, tenz machines, massage thumpers, etc – yet still no relief.

This is when the owner, Kathleen Busfield, goes to work. She already knows what doesn’t work on the horse, so she starts from scratch, creating and tinkering like a mad scientist. Seriously. It’s something to watch her work. She hunkers down for hundreds of hours of research. Then one day, stacks of boxes begin arriving containing potential ingredients. So focused is she that she barely sleeps or eats.

And then the “putting together” phase begins.

When she is in her zone, everyone at the barn knows to NEVER take anything from her fridge. Because while a bottle may say “Welch’s Grape Juice,” it is far more likely one of her test concoctions. [ Yep, some of them are not very tasty.] Finally, when her creation is complete and the original horse has benefited from its use, she expands her testing throughout the barn. (NOTE: She does not just test a few horses for a few weeks, but rather tests many hundreds of horses over the course of 1-2 years. We often have to plead with Kathleen to let us begin marketing her creation. She refuses to let her baby out of her sight until she absolutely knows it is exactly how she wants it – and most importantly, when she looks somebody in the eye and says it works – it will work.


Originally from Victoria, Canada, Kathleen has been riding horses since she was 7 years old. She rode her bike to the barn, paying her way by mucking stalls before and after school. Her passion was Show Jumping. As the years passed, she continued to learn everything she could about horses, horsemanship, and the sport. Throughout her youth, and in spite of all the distractions of high school, college, and the other sports she enjoyed, Kathleen’s true love remained horses. She became a trainer’s assistant and soon found herself working at a prestigious barn in Oregon. Eventually, she ended up in Southern California. She moved her way from assistant to head trainer and eventually began her own successful riding/training program.

In 2004 Kathleen saw a desperate need for a quality sport horse rehabilitation facility. After all, most of the horses she works with are pro athletes, and just like a professional basketball or football player, injuries occur. At that time in the Los Angeles area, there were few, if any, facilities that specialized in rehabilitation and reconditioning.

She found a 50-acre parcel of land in the quiet hills of Simi Valley, just 30 minutes from the crowded LA Equestrian Center. There she began building. Now not only does Four Oaks Farm have over-sized bright stalls, eurosizer, treadmill, 14,000 sqft of rubber matting, etc., but Kathleen also built a 250’x150′ USEF arena to properly recondition the horses once they are able to get back to work.

In 2010 Kathleen’s first product creation became a reality (No Thrush Powder). She was confronted with a case of equine thrush, which is an equine foot ailment, that she nor any of the vets she worked with could get under control. There began the Mad Scientist mode. Long story short, she created a new completely outside-the-box product that not only fixed the specific horse in question, but all the other horses in the barn, all of her friend’s horses, and finally it found its way into the local stores. Now 14 years later, No Thrush and its sister products are sold worldwide and are the go-to for all pet and equine hoof, foot, skin and coat problems.


At the Farm, Heath is otherwise known as “Kathleen’s husband.” He is the guy that floats around on the weekends lugging toolboxes, skill saw, sprinkler fittings, and plumbing implements – fixing this and that and trying to stay out of the boss-lady’s way. Heath grew up in the Colorado mountains, living the rural life. He worked with horses from an early age. A big kid for his age, Heath spent the summer between 6th and 7th grade on a logging crew high up in the San Juan Mountains. His job was to section the felled logs into 8 ft lengths, and then run a team of gigantic draft horses to drag the logs out of the deep forest. He nicknamed the drafts Heckle and Jeckle due to their often-caustic sense of humor.

At age 13, he spent the summer working at a Colorado dude ranch, wrangling horses (and people). He learned how to drink coffee during those 4:30 am mornings. Herding 30 horses out of a 100-acre pasture every morning required caffeine and patience. Heath moved to South Dakota at age 14. With his mom’s help, he started his first business. He purchased 4 two-year-old colts, broke and trained them, and then sold them. The company was a bust, however, because he lost a quarter of his profits after falling in love and keeping “Good ol’ Sackett” (who was a not a so “good” Arabian roan) Sackett was a runner. If you gave him his head, he would bolt, ears back, eyes white and manic. Heath truly had to cowboy up to get him under control. Quickly he devised a plan to only let Sackett “run” when he was headed uphill. It had to be a big hill, though, because if Sackett wasn’t exhausted by the time he reached the top – the downhill white-eyed run was terrifying.

Heath left home at 17 and moved to Aspen, Colorado. There he met a photographer while busing tables. The woman asked him to sit for some fashion photos. They weren’t very good, but the experience began a new twisting trail in Heath’s life. He moved to Los Angeles, did some modeling while also training horses in Malibu for a Hollywood film mogul, and within a few months, he was invited to model in Paris. He stayed in Europe for a year. (Where, incidentally, he was struck by lightning during a solo camping trek up Mont Blanc, but that’s another story.)

Back in LA, Heath quickly moved from modeling to acting. He worked with top celebrities and directors in the industry with stints in Wyatt Earp, Doctor Quinn Medicine Woman, and eventually as a series regular on The Young and the Restless. After 20 years, he transitioned again, from acting to writing, penning two novels and a memoir, and countless film and television scripts.

Finally, he met Kathleen. Except for the western movies he performed in, Heath had been away from his equine roots for most of his time in Hollywood, and he could not believe his luck when he found a “horsewoman” in the middle of LA!

In 2010, as he watched Kathleen working on her first variations of No Thrush powder and then saw how her colleagues kept begging her to make some more of her “Thrush Stuff,” Heath finally suggested,
“This is clearly something that works, and people seem to want it. We should make a big batch and see if it will sell.”

That was the beginning. The husband and wife team worked in the garage into the late hours making powder and working out the logistics. There was a lot to learn! Internet sales went crazy right away, and they were up until midnight every night packing boxes. Soon No Thrush was in the local stores and then spreading outward in a ripple effect. Within a year, the product was sold nationally and had jumped the pond into the EU, Japan, AU, NZ, etc.

Heath now runs the Four Oaks Products. Just as he does on the weekends at the farm, he wears many hats and carries many toolboxes.