Please review the attached PDF document that Dr. Chris Shade wrote about this topic for full details.
Here is the conclusion statement from the document:
With any new technology, well-intentioned questions are inevitable and will need to be answered. For a product that works exceptionally well, the question: “Does it work too well,” is natural and necessary. Fortunately, the answer regarding phospholipid-based delivery technologies such as liposomes is backed by decades of research and is a resounding, “Yes, they are safe.”"