| 2017 | USA, Guest Lecture at Tulane University, New Orleans, USA, visit to NCSU,Dept of Material Eng, Textile Eng, Guest lecture to PANIIT, Raleigh, NC |
| 2015 | 40th FEBS meeting Guest lectures and Nürnberg City, Berlin, Germany, Prague, Czech Republic,visits Copenhagen, Denmark, Uppsala, Sweden, Amsterdam, Netherland,Brussels, Belgium, Paris, France |
| 2012 | Conference, Kings College, London, UK |
| 2008 | Conference , National ayurvedic Medical Association (NAMA), October 16-16, Chicago, |
| 2008 | Guest lecture Dept. of Pharmaceutical Science, College of Pharmacy, 1401,Albrecht Boulevard, Fargo, USA |
| 2008 | Guest lecture Geriatric Research, Education & Clinical Centre (GRECC), Vapalo Alto Healthcare System, Stanford University School of Medicine, USA |
| 2008 | Guest lecture Dept. of Ophthalmology and Visual Sciences, Eye and Ear Inflmary, Lions of Illions Eye Research Institute, 1855, West Taylor Street, Chicago, USA |
| 2008 | Guest lecture Institute for Medical Radiation Biology, University of Duisburg- Essen,Medical Biology, Essen, Germany |
| 2004 | Guest lecture Dept of Pharmacology, University of Pittsburgh, USA |
| 2004 | Guest lecture Dept of Chemistry, University of Machachutes. Dartmouth, USA |
| 2004 | Guest lecture Dept of Department of Pathology, Uniformed Services University Health Sciences, Bethesda, MD 20814, USA |
| 2004 | Guest lecture Dept of Neurology, University of Southern California, USA |
| 2004 | Guest lecture Dept of Cardiology, Seders Sinai, Cardiology center, UCLA, USA |
| 2004 | Visiting Scientist Dept of Nutritional Sciences, Oklahoma state University, USA |
| 2004 | Visit and discussion Dept of Gastroenterology, Washington University, St Louis, USA |
| 2004 | Visit and discussion Dept of Oncology, Kansas state University, Kansas, USA |
| 2000 | Guest lecture Cum Herbal medicine and New Drug development, at Dept of Visiting Scientist Biochem, University of Tokyo, Japan (Sep 2-6) |
| 2000 | Guest lecture Role of Guggulu in metabolic diseases with reference to (Sep 9-10) Hyperlipidemia, 3rd Conference on Ayurveda, New York,USA, |
| 1998 | Presented Paper “6th International Congress on PAF and related Lipid mediators, New Orleans,USA (Sept. 21-24) |
| 1998 | Guest lecture Mercy Cancer Institute, Pittsburgh, USA, Oct.3 |
| 1998 | Guest lecture Calyx Therapeutic Inc. Hayward, California, USA, Oct.1 |
| 1998 | Guest lecture Dept. of Urology, Cleveland Clinic Foundation, Cleveland, USA, |
| 1998 | Visiting Scientist Division of Cardiology, Cedars Sinai Medical Center, UCLA School of Medicine, USA,(Sept.25-30) |
| 1998 | Visiting Scientist Laboratory of Neuroscience, Dept. of Anatomy, Bio-Med. Center, Univ. of Uppsala, Sweden, |
| 1996 | Visiting Scientist, School of Dentistry, Temple Univ. Philadelphia, USA |
| 1991 | Visiting Scientist School of Medicine, University of Missouri, USA |
| 1987 | Visiting Scientist Academy of Czech, Prague, Czechoslovakia |
| 1983 | Visiting Scientist Tubingen University, Germany |
