Hi, Liisa, I can't speak to the liposomal GSH, as my family hasn't used it. Most people use Theranaturals because a) Theranaturals makes the only buffered GSH suitable for inhalation, b) they created the GSH-Curc Caps on my advice specifically to help the GSH systems of CF persons, c) they don't price-gouge and they give a discount on bulk orders, d) I asked them to do purity tests and LPS tests on their GSH to make sure we really had pharmaceutical grade GSH in there, and the tests were passed with flying colors, and e) they ship overseas. But aside from the specially buffered GSH for inhalation (which, to my knowledge, you can still only get from Theranaturals), you should feel free to get your oral GSH from any source that you trust.