Lead is a naturally occurring mineral found in the water, soil, and air, as well as many every day foods and botanicals.

The FDA has developed safe/tolerable lead exposure levels for particular age and sex groups referred to as provisional total tolerable intake levels. In early 2007, FDA conducted a limited survey by an independent testing firm to determine the lead content in multivitamin supplements for women and children, including a number of Rainbow Light products. The results of the survey were published in the Journal of Agricultural and Food Chemistry in July 2008 and on the FDA website in August 2008. As a result of its survey, the FDA concluded that lead in the women's and children's vitamins tested was below the FDA's safe/tolerable levels.

Proposition 65 is a portion of the California Health and Safety Code that regulates a variety of chemicals, including lead. Proposition 65 has established a "No Observable Effect Level" for lead, which is lower than the FDA's safety/tolerable level. The Attorney General of the State of California, which enforces Proposition 65, recently filed an industry-wide lawsuit for the purpose of addressing the precise allowable levels of naturally occurring lead in multi-vitamins sold in California.

Rainbow Light regularly tests its products to ensure that any naturally occurring lead levels are within the FDA's and Proposition 65's safety levels. Rainbow Light uses botanical materials with the lowest detectable lead level available on the market and utilizes strict testing methods to ensure continued compliance with these requirements.