We purchase from the largest and most trusted manufacturers in Korea who export their products to many countries globally. They have received numerous awards and certifications, some of which include the KFDA (Korea Food and Drug Administration), MHLW (Japan Ministry of Health, Labour and Welfare), ISO (International Standard Organisation), CE (Conformité Européenne), KGMP (Korea Good Manufacturing Practice) and UKAS (United Kingdom Accreditation Service). These contact lenses do not pose a health risk any more than regular conventional contact lenses do. If you don't practice proper hygiene and don't take care of them, of course there will be a risk wearing them.
If you follow proper contact lens care instructions (e.g. disinfecting, rinsing and storing them in solution, washing your hands with antibacterial soap before touching them, not wearing them for extended periods, not sleeping in them, etc.), then you should have no health issues concerning the use of not just these lenses, but any kind of contact lenses. These lenses, just like regular contacts, come in hermetically sealed vials in buffered, sterile saline solution. Therefore, they are safe to wear, but your health, again, depends on how well you follow a hygiene regime!