That lawsuit is old news. C4 has not been manufactured with the ingredient 1, 3 DMAA in over 18 months.

Anyways, to answer the question, C4 could in fact have the ability to affect certain birth control meds. Birth control medication could become compromised when the user consumes products with caffeine or stimulants. C4 does in fact contain caffeine, about 1-1.5 cups of coffee worth. Its best to speak with your doctor to make sure that you could take the C4 product.

I'd be more concerned about this...