Aging and lifestyle stressors are responsible for collagen’s inevitable decline. In fact, collagen starts to decline as early as the late 20s and can be expedited with smoking and UV damage, even stress due to elevated cortisol levels, which can break down collagen. Collagen is the main structural protein found in skin and responsible for the skin’s plump, radiant and youthful appearance. Right now, beauty enthusiasts have collagen on the brain… and, oddly enough, beef tallow (thanks...