USANA Health Sciences Announces Partnership With Kathy Kaehler

SALT LAKE CITY—(BUSINESS WIRE)—January 4, 2010—USANA Health Sciences, Inc.
(NASDAQ:USNA) is proud to announce its partnership with fitness expert and celebrity trainer
Kathy Kaehler.

“I am delighted to announce my new partnership with USANA,” said Kaehler. “As a fitness professional for most of my life, I know how important it is to maintain your health. Exercise and proper nutrition is key, but that alone is not enough. USANA is the answer to making
sure your body is getting exactly what it needs every day.

USANA’s extraordinary standards take nutritional supplements to another level, not to be compared.”
Kathy Kaehler, author and celebrity fitness trainer, has devoted her life to helping people live happy and healthy lives.

For 13 years, Kaehler appeared on the Today show as the fitness correspondent while training such celebrities as Julia Roberts, Michelle Pfeiffer, Cindy
Crawford, Jennifer Aniston and many more. Kaehler will share her top-notch fitness solutions and star-shaping secrets along with healthy diet tips and recipes that feature USANA nutritional food products and supplements.

“We are thrilled to announce Kathy Kaehler as the newest member of the USANA family,” said
Dan Macuga, USANA Vice President of Marketing and Public Relations. “Kathy will be a great
asset to our world class product offerings, and I think USANA customers and Associates will
find great value in her expert health and fitness tips.”

Contact: Dan Macuga
Vice President of Marketing & Public Relations
USANA Health Sciences, Inc.
(801) 954-7280
Dan.Macuga@us.usana.com