Royalty, celebrities and heads of states all can't be wrong when they check into Clinique La Prairie, a world renowned medical and revitalisation centre in the resort city of Montreux on the shores of Switzerland's scenic Lake Geneva. And according to the centre's president, Arman Mattli (pictured), most of them come for the cellular therapy, a rejuvenation treatment involving extracts taken from the livers of black mountain sheep foetuses. It is administered via injections and, according to Arman, the treatment revitalises ageing cells and boosts the immune system. Arman says he has a large Hong Kong clientele, including many tycoons and their wives who have undergone the treatment, which takes a week and costs about US$20,000 (HK$155,000). Arman says 80 per cent of their patients return after two or three years. Arman was a former Swiss banker who, 21 years ago, was approached by a friend who wanted him to buy Clinique La Prairie. Bored with his job, he agreed. 'Clinique La Prairie was a business with humanity at the same time, unlike banking, which is a cold business,' he says. Apart from cell rejuvenation, Arman also developed the famous La Prairie skin-care brand, which he sold to a US multinational. He has now developed another range of skin-care products, Swiss Perfection, which is available through Beauty Clinic by Su in Central. 'This line of skin products I developed specially for Asian skin and it contains placenta . . . the skin is the largest organ on the human body and its important to take care of it.' But, according to Arman, the secrets of feeling good and looking young are more than skin deep. 'I do a little exercise and I am careful about what I eat . . . plus I have the cell extract injection every year.'