Manufacturers
- Aromatics International Inc
- Aromtech Ltd.
- Arrow OTC Inc.
- Arrowroot
- ARSA Distributing, Inc.
- Art of Living Foundation
- Artesa Labs, LLC
- Arthri-D, LLC
- Arthritis Research Corp.
- ArthrOrganics
- Arthur Andrew Medical
- Artizen
- ArtJen Complexus Holdings Corp.
- Arvidis
- Arvokanta Oy
- Arya Vaidya Pharmacy
- ASAC Pharma
- Asahi Breweries Co. Ltd.
- Asahi Food and Healthcare, Ltd.
- Asahi Group
- ASC Supplements
- Ascendia Brands (Canada) Ltd.
- Ascent Protein
- Ascenta Health
- ASEA, LLC
- Asia MedLabs, Inc.
- ASN - Advanced Sports Nutrition
- Aspen Copacking
- Aspen Group, Inc.
- Asphalia Food Products
- Aspire Brands, Inc.
- aSquared Brands LLC
- ASR Research
- ASR Sports
- Assault Labs
- Assault Nano Series
- Assertive Wellness
- AST Sports Science
- Astavita
- Astra Natural Health Incorporated
- AstraZeneca
- Astroflav
- At Large Nutrition LLC
- At Last Naturals, Inc.
- ATC Healthcare
- ATH Organics
- ATH Sports
- Athlean-RX
- Athletic Alliance
- Athletic Brewing Co.
- Athletic Edge Nutrition
- Athletic Greens (USA), Inc.
- Athletic Technologies Inc.
- Athletic Xtreme
- Atkins Nutritionals, Inc.
- Atlantic Biologicals Corps
- Atlantic Naturals
- Atlantis Nutrition
- Atlas Operations, Inc
- Atlas World USA
- Atley
- Atomic X
- Atomy Co., Ltd.
- ATP Athletic and Therapeutic Pharma
- ATP Mechanix
- ATP Science
- Atrium Inc
- Atrium Innovations Inc
- ATS Labs
- Atsenti, Annedda L'Arbre de Vie Inc.
- Attune Foods, Inc.
- ATX Sport Technology
- Au Naturel Inc.
- Aubrey Organics
- Augustine, Inc.
- AUM Pharmaceuticals
- Aura Cacia
- Aura Essentials, Inc.
- Aurohealth LLC
- Auromere
- Aurora Nutrascience
- Auspharm Australia Pty Ltd
- Austin Research Institute
- Australian Sports Nutrition
- Auum Canadian Distribution Centre
- Auxigen Health
- AVA Phytoceuticals
- Avacor Products LLC
- Avadim Technologies Inc.
- Avalon Natural Products
- Avalon Organics
- Avanse Nutraceuticals
- Avant Labs
- Avantera Health, LLC
- Avena Originals
- Avenger Performance Nutrition
- Aventura Pharmaceuticals, LLC
- aVeryVitamin
- Avesil LLC
- Avesthagen Inc.