Enhance your herd's health, digestion and milk quality, the natural way.

CowMaster and Dr. Karreman’s products have been tested and trusted by veterinarians and farmers across the country. Healthier cows and higher quality milk are possible without traditional antibiotics.

Acclaimed Veterinarian Hubert Karreman brings his vast knowledge of holistic animal care to every product. CowMaster is now Dr. K's. Same Dr. Hubert Karreman, same reliable formulas.

And...get FREE SHIPPING in the US or Canada on your first order!

PhytoMast™ uses all-natural, plant-based technology to improve milk quality without antibiotics. Watch the video below to learn more, and then get started with our special introductory offer!

"PhytoMast™ has “consistent antibacterial activity against the 3 mastitis-causing organisms."

K.A. Mullet, et. al Journal of Dairy Science, 2014 Sep; 97(9):5587-91

"Based on dilution of the products in bovine milk at physiologically achievable levels, phytoceutical products (including PhytoMast™), tested at levels expected after treatment do NOT cause positive test results for the Delvotest P no do they interfere with the Charm SL Beta-lactam test in detection of various antibiotics."

Mullen KAE, et.al. Veterinary Record Open 2017;4:e000214. doi:10.1136/vetreco-2016-000214

"The efficacy of herbal products was similar to that of conventional (antibiotic) therapy, and the herbal products had no apparent adverse effects."

Effect of two herbal intramammary products on milk quantity and quality compared with conventional and no dry cow therapy. Journal Dairy Science 2014 June; 97(6):3509-22

"It is concluded that treatment with the botanical preparation PhytoMast™ resulted in a reduction of the time to clinical recovery."

Efficacy of a Botanical Preparation for the Intramammary Treatment of Clinical Mastisis on an Organic Dairy Farm. Canadian Veterinary Journal 2013 Mar;54(5):479-484
Enhance your herd’s
  • Health
  • Digestion
  • Milk Quality