Which entrepreneur joined Dragon's Den as a regular Dragon in series 15?

Tej Lalvani joined Dragon's Den as a regular Dragon in series 15.

Lalvani became a regular investor on the BBC programme in series 15. He is a British entrepreneur associated with the health and nutrition industry and served as chief executive of Vitabiotics, a company founded by his father, Kartar Lalvani. His professional background gave him particular interest in consumer health products, supplements, and brands seeking wide distribution.

His appointment was part of the programme's continuing renewal of its investor panel. Dragon's Den has changed its lineup repeatedly, so series numbers provide a useful way to distinguish similar-looking facts about when individual investors arrived.

Tej Lalvani should not be confused with Touker Suleyman, who joined earlier, or Sara Davies and Steven Bartlett, who joined later. The question identifies Lalvani's first regular-panel series rather than a guest appearance, a one-off pitch, or an investment made outside the programme.