SHASTA COUNTY, Calif. - Dr. Larry Pyle did not enter a plea in court in Shasta County on Tuesday.
Pyle's attorney filed a challenge to the charges against him.
He is accused of illegally supplying Botox to Susan Trancreto, who then gave Botox injections to patients without a license.
Prosecutors say some of her patients suffered facial deformities and may require long-term medical care.
Tancreto pleaded not guilty last week.
Pyle is due back in court on Feb. 11.