Is it possible to additionally use moisturizing intimate gels during intercourse when using Adaring? Does it somehow reduce the effectiveness of the ring, or is it unhygienic?

Moisturizing intimate gels can be used when using the Adaring disc, provided that their packaging states that they can be used with vaginal contraception. Each gel has a different composition, so I can not name you specifically which can and which can not - you must always read the gel leaflet. The issue of hygiene is an individual matter - it depends on who means what by it. In my opinion, the use of moisturizing gels for clean and well-groomed intimate areas is in no way unhygienic.