Collagen ComplexCollagen Complex no way is the content here a substitute for qualified medical advice. Always actively seek a professional dietitian, certified nutritionist, licensed specialist or your doctor for specific consultation before using any supplement our team reviews.Collagen Complex provides the one substance all our joints and cartilages need. But as we age our body produces less and less collagen. This is why our joints become frail and our skin becomes wrinkled. Collagen is also one of the keys to a healthy gut lining barrier.