Exhibit 99.1

USANA Board Authorizes Additional $30 Million for Share Repurchases

    SALT LAKE CITY--(BUSINESS WIRE)--May 3, 2005--USANA Health
Sciences Inc. (Nasdaq: USNA) today announced that its board of
directors has authorized an additional $30 million for share
repurchases of its outstanding common stock.
    Repurchases will be made from time to time, in the open market,
through block trades or otherwise, and will be funded with internally
generated cash. The number of shares to be purchased and the timing of
purchases will be based on market conditions, the level of cash
balances, general business opportunities, and other factors.
    On April 22, 2005, USANA announced that it had increased the
amount available for additional share repurchases to $10 million.
Repurchases under that previous authorization have been completed.
During 2004, the company repurchased a total of 1.2 million shares for
a total investment of $34.9 million or an average of $29.02 per share.
    USANA had 18,927,128 common shares outstanding as of April 29,
2005.

    About USANA

    USANA develops and manufactures high-quality nutritional and
personal care products that are sold directly to Associates and
Preferred Customers throughout the United States, Canada, Australia,
New Zealand, Hong Kong, Japan, Taiwan, South Korea, Singapore, Mexico,
the Netherlands, and the United Kingdom. More information on USANA can
be found at http://www.usanahealthsciences.com.

    Safe Harbor

    This press release contains forward-looking statements within the
meaning of Section 27A of the Securities Act and Section 21E of the
Securities Exchange Act. Actual results could differ materially from
those projected in these forward-looking statements, which involve a
number of risks and uncertainties, including reliance upon our network
of independent Associates, the governmental regulation of our
products, manufacturing and marketing risks, and uncertainties
associated with our planned international expansion. The contents of
this release should be considered in conjunction with the risk
factors, warnings, and cautionary statements that are contained in our
most recent filings with the Securities and Exchange Commission.

    CONTACT: USANA Health Sciences Inc., Salt Lake City
             Riley Timmer, 801-954-7100
             investor.relations@us.usana.com