Supplement Cert Directory

Best vitamin d for Immune Support

Third-party-tested supplement types commonly associated with immune support routines.

52 third-party-certified brands listed below — certification status is factual; this is not medical or efficacy advice.

Ranked by number of independent third-party certifications (Labdoor letter grade breaks ties). This reflects how thoroughly each brand is independently verified — not product quality, efficacy, or price, and not an endorsement.

RankBrandCertificationsIndep. bodiesProductsShop
#1 Most independently tested AG1 NSF_DIETARY NSF_SPORT 21Shop:AmazoniHerb
#1 Most independently tested Aurora Nutrascience NSF_DIETARY NSF_SPORT 23Shop:AmazoniHerb
#1 Most independently tested Core Med Science NSF_DIETARY NSF_SPORT 25Shop:AmazoniHerb
#1 Most independently tested Designs for Health NSF_DIETARY NSF_SPORT 22Shop:AmazoniHerb
#1 Most independently tested LTF Club Operations Company, Inc. NSF_DIETARY NSF_SPORT 22Shop:AmazoniHerb
#1 Most independently tested Momentous NSF_DIETARY NSF_SPORT 22Shop:AmazoniHerb
#1 Most independently tested Natura Health Products NSF_DIETARY NSF_SPORT 21Shop:AmazoniHerb
#1 Most independently tested Nordic Naturals NSF_DIETARY NSF_SPORT 22Shop:AmazoniHerb
#1 Most independently tested Vinatura NSF_DIETARY NSF_SPORT 21Shop:AmazoniHerb
#1 Most independently tested dotFIT NSF_DIETARY NSF_SPORT 21Shop:AmazoniHerb
#111st Step ProWellness INFORMED 11Shop:AmazoniHerb
#116d Sports Nutrition INFORMED 11Shop:AmazoniHerb
#11Access Business Group, LLC NSF_DIETARY 12Shop:AmazoniHerb
#11Amazon.com Services, LLC NSF_DIETARY 11Shop:AmazoniHerb
#11BJ’s Wholesale Club, Inc. NSF_DIETARY 11Shop:AmazoniHerb
#11Boston Nutraceutical Science NSF_DIETARY 11Shop:AmazoniHerb
#11Captek Softgel International, Inc. NSF_DIETARY 13Shop:AmazoniHerb
#11Centenarian Road INFORMED 11Shop:AmazoniHerb
#11Codeage NSF_DIETARY 11Shop:AmazoniHerb
#11Ddrops Company NSF_DIETARY 112Shop:AmazoniHerb
#11Farmacias de Similares TX LLC NSF_DIETARY 11Shop:AmazoniHerb
#11Flynew Global Inc NSF_DIETARY 11Shop:AmazoniHerb
#11Genexa Inc. NSF_DIETARY 11Shop:AmazoniHerb
#11H-E-B, LP. NSF_DIETARY 11Shop:AmazoniHerb
#11Healthspan Elite INFORMED 14Shop:AmazoniHerb
#11Heartwise Incorporated NSF_DIETARY 16Shop:AmazoniHerb
#11International Vitamin Corporation NSF_DIETARY 111Shop:AmazoniHerb
#11Kinetica INFORMED 11Shop:AmazoniHerb
#11MOM Enterprises, Inc. NSF_DIETARY 11Shop:AmazoniHerb
#11Magceutics LLC NSF_DIETARY 11Shop:AmazoniHerb
#11MaxiNutrition INFORMED 11Shop:AmazoniHerb
#11Minami INFORMED 12Shop:AmazoniHerb
#11NORSAN INFORMED 11Shop:AmazoniHerb
#11Natural Health Partners, LLC NSF_DIETARY 11Shop:AmazoniHerb
#11Nature Made USP 13Shop:AmazoniHerb
#11Nutriburst INFORMED 11Shop:AmazoniHerb
#11Nutrition X INFORMED 11Shop:AmazoniHerb
#11Puresport INFORMED 11Shop:AmazoniHerb
#11Raw Sport INFORMED 11Shop:AmazoniHerb
#11SCN Bestco NSF_DIETARY 13Shop:AmazoniHerb
#11Science In Sport INFORMED 11Shop:AmazoniHerb
#11Smarter Nutrition Inc. NSF_DIETARY 11Shop:AmazoniHerb
#11Soccer Supplement INFORMED 11Shop:AmazoniHerb
#11SunVit Pro INFORMED 11Shop:AmazoniHerb
#11Target Corporation NSF_DIETARY 14Shop:AmazoniHerb
#11The Pause Life Supplements, LLC NSF_DIETARY 11Shop:AmazoniHerb
#11Theralogix, LLC NSF_DIETARY 15Shop:AmazoniHerb
#11Thorne NSF_DIETARY 16Shop:AmazoniHerb
#11Vital Choice Seafood LLC NSF_DIETARY 13Shop:AmazoniHerb
#11Wegmans NSF_DIETARY 12Shop:AmazoniHerb
#11Wholesome Story, LLC NSF_DIETARY 13Shop:AmazoniHerb
#11fourfive cbd BSCG 13Shop:AmazoniHerb

See all certified vitamin d brands .