The FAQ points to a GMP-certified, FDA-registered US facility and natural, non-GMO ingredients, then asks certain people to consult a doctor first.
Manufacturing standards and ingredient sourcing. It also names groups who should talk to a professional: people who are pregnant, nursing, under 18, taking blood thinners, or who have a diagnosed condition.
Facility registration is not product approval, and a general safety statement cannot know your health or medications. Ginger Root and Bromelain both have documented interaction potential with blood-thinning medication, so that conversation with your doctor is the real safety step.