Hyaluron Swisscode Serum Side Effects & Safety. Do facial serums that contain hyaluronic acid work? And are they safe? Maybe they work, but there’s no evidence. And where safety is concerned, what researchers have found so far is that there are no major hazards associated with the use of hyaluronic acid serums — but there aren’t enough safety studies to say this for sure.
Doctors say they’re safe when used the way they’re supposed to be: to treat osteoarthritis and to replace eye fluid during eye operations. Still, they’re generally safe and allergic reactions are rare.