Following reports that she is “against” vaccinations, Jessica Biel took to Instagram to clarify her stance.

The 37-year-old responded to the news that she lobbied alongside controversial anti-vaxxer Robert F. Kennedy Jr. against a pro-vaccine bill in Calfornia.

She wrote: “This week I went to Sacramento to talk to legislators in California about a proposed bill. I am not against vaccinations — I support children getting vaccinations and I also support families having the right to make educated medical decisions for their children alongside their physicians. My concern with #SB276 is solely regarding medical exemptions. My dearest friends have a child with a medical condition that warrants an exemption from vaccinations, and should this bill pass, it would greatly affect their family’s ability to care for their child in this state.”

Biel continued: “That’s why I spoke to legislators and argued against this bill. Not because I don’t believe in vaccinations, but because I believe in giving doctors and the families they treat the ability to decide what’s best for their patients and the ability to provide that treatment. I encourage everyone to read more on this issue and to learn about the intricacies of #SB276. Thank you to everyone who met with me this week to engage in this important discussion!”

Earlier this week, Kennedy Jr., 65, shared a slideshow of himself and Biel alongside activists and lawmakers. “Please say thank you to the courageous @jessicabiel for a busy and productive day at the California State House,” Kennedy Jr. wrote.

The bill would limit medical exemptions from vaccinations. The Center for Disease Control says that links that anti-vaxxers point to between vaccines and autism, ADD, ADHD and other issues are not valid; they have also been widely dismissed by scientists. The CDC has come out strongly for vaccines in the wake of a rash of deadly measles outbreaks across the country in communities that do not vaccinate their children.

Biel shares a 4-year-old with Justin Timberlake.