| Rank | Clinic Name | Patient Rating | Country | Lead Doctor | experience | Techniques | Best For | Why It’s Ranked | Accreditations |
|---|---|---|---|---|---|---|---|---|---|
| #1 | 4.6 / 5 (175) | Vienna, Austria | — | — | Intravenous vitamin C therapy | — | Clinical oncologist in the top 2% of scientists worldwide personally analyzes your documents for IV vitamin C therapy. Clinic is ISO 9001 certified and rated 4.7/5. | World's Best Hospitals 2021 by Newsweek, International Organization for Standardization | |
| #2 | 4.2 / 5 | Vienna, Austria | 32+ years | Intravenous vitamin C therapy | — | — | — |