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A campaign to make California the first state to require labeling of genetically modified foods has raised $2.3 million in donations, compared with $2 million collected by opponents, state records show.

Mercola.com LLC, a closely held distributor of vitamins and nutrition products based in Hoffman Estates, Illinois, donated $800,000 to back the November ballot initiative as of July 27, according to data posted on the Secretary of State’s website. Major contributors to the campaign against the measure include PepsiCo Inc. (PEP) (PEP), the world’s largest snack-food maker, Nestle SA (NESN)’s Nestle USA and Coca-Cola Co. (KO) (KO), records show.

California voters were among the first to ban junk food from schools and trans-fats from restaurants. Proponents, financed by Mercola and several organic farms, are focusing their effort on the most-populous state after the failure of similar legislation in 19 states and the rejection of a petition to the U.S. Food and Drug Administration in April.

“People want to know whether their food contains genetically engineered ingredients,” Stacy Malkan, a spokeswoman for the Oakland-based California Right to Know campaign, said by telephone. “This type of labeling is standard procedure in much of the industrialized world.”