1. The holder of record of the shares of Common Stock disposed is Gull Global Limited, an entity wholly indirectly owned and controlled by Dr. Myron W. Wentz.

2. Weighted average price. Price range in multiple transactions was $66.00 to $66.10, inclusive. The reporting person undertakes to provide USANA Health Sciences, Inc., any security holder thereof or the staff at the Securities and Exchange Commission information regarding the number of shares sold at each price within the ranges set forth.

3. The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 14, 2017.

4. Weighted average price. Price range in multiple transactions was $64.85 to $65.85, inclusive. The reporting person undertakes to provide USANA Health Sciences, Inc., any security holder thereof or the staff at the Securities and Exchange Commission information regarding the number of shares sold at each price within the ranges set forth.

5. Weighted average price. Price range in multiple transactions was $64.40 to $65.40, inclusive. The reporting person undertakes to provide USANA Health Sciences, Inc., any security holder thereof or the staff at the Securities and Exchange Commission information regarding the number of shares sold at each price within the ranges set forth.