The Growth serum is infused with amino acids, biotin, and herbal extracts to help support healthier and stronger hair growth. The Growth Vitamins helps restore your strands back to health they are infused with vitamins, minerals, amino acids, antioxidants, and DHT blockers these vitamins encourage growth, provide strength, softness and shine. They can be used/taken alone, but for maximum results they should be used/taken together.