CFR › Title 21 › Part 346 › §346.1621 CFR §346.16Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy linkThe active ingredient of the product consists of any of the following when used within the concentration range established for each ingredient:(a)Camphor 0.1 to 3 percent.(b)Juniper tar 1 to 5 percent.(c)Menthol 0.1 to 1 percent.