Manufacturers
- K-Link International
- K-mart
- K.C. Herb Product Ltd. H.K.
- K2 Incense
- Kaboom Action Strips
- Kaged Muscle
- Kaizedo
- KALA Health BV
- Kala Health Inc.
- Kalchem International
- Kali Muscle
- Kallistia
- Kam Yuen Medicine Company
- Kami Sante
- Kamsut Inc dba The Kama Sutra Company
- Kan Herb Company
- Kancor Ingredients Ltd
- Kanec USA Inc.
- Kaneka North America, LLC
- Kanematsu Wellness Corporation
- Kangniling (KNL) Pharmaceutical Company
- Kankaisten Öljykasvit Ltd
- Kaplan Laboratory, LLC
- Kappa Nutrition
- KaraMD, Inc.
- Kare & Hope Inc.
- Kare ~N~ Herbs
- KareMor International
- Karuna Corporation
- Kashi Company
- Kat's Naturals
- Katalyst Nutraceuticals
- Katz Group
- Kaya Naturals
- Kaymall
- Kayson Hong Enterprises Limited
- Kaz, Inc.
- KBS Research, Inc., LLC
- KDA Global LLC
- KE Health
- Kee Sun Enterprises Inc
- Kei Two Communications
- Kellogg's
- Kemin Industries, Inc.
- Kemol Ventures Ltd
- Kempo LLC
- Kendy Canada Products Limited
- Kenko Zoshin Co Ltd
- Kenkoukazoku Co Ltd
- Kenote Marketing Ltd.
- Kenwood Therapeutics
- Kenzayu Inc
- Ketality, LLC
- Keto Bodytone
- Ketolabs
- KetoLogic, LLC
- Ketologie LLC
- Ketond Nutrition
- Ketone Advanced
- KetoneAid Inc
- Ketonedrops.com Inc
- Ketopharm USA
- KetoSports, Inc.
- Kevis Rejuvenation Programs, Inc.
- KeVita
- Kewlify
- Key Nutrients
- Key Therapeutics, LLC
- Key2Health, Inc.
- KeyView Labs, Inc.
- Khaolaor Laboratories Co., LTD.
- Khroma Herbal Products
- Kibow Biotech, Inc.
- kidsWellness
- Kikkoman Nutricare Japan Inc.
- Kill Cliff, Inc.
- Kilo Labs
- KiloSports Nutrition