This is a genetic condition , herbs in general are not very effective for correcting gene defects (in this case ones that promote collagen formation). Herbs that stabilize collagen such as Amla, Gotu Kola, Turmeric, Hawthorn may offer some modest benefits, and Vitamin C may help with easy bruising. As for the constipation the Ayurvedic formula Triphala would be my first option.