Chairman Cheng, now in his sixties, was born into a well-off family and began using cosmetics at a young age. However, cosmetics manufactured 40 to 50 years ago often contained lead or mercury, which led to skin allergies and even photosensitivity. As a result, he has since avoided using most cosmetic products except for high-end premium brands. After being introduced by a friend to peptide nucleic acid products for both internal consumption and topical application, his skin condition improved significantly. He no longer experiences allergic reactions or swelling.