Helena Christensen has been tapped as a brand ambassador for Lumity, an anti-aging supplement created by Dr. Sara Palmer Hussey.   “Helena embodies the idea of living a Lumity Life – with health and vitality to make the most of every day,” says Lumity's CEO David Wasilewski. “Partnering with her as a global ambassador was an easy decision. She is a long-time customer, and shares the brand's philosophy that the body knows best and nourishing yourself on the inside sh...