1. What is the objective of HA serum?
2. What is the objective of the Hyper Glow Serum?
3. How do you use Hyaluronic Acid Serum?
4. How do you use Hyper Glow Serum?
5. How long will these bottles last?
6. The color of my Hyper Glow changed to a yellow, why is that?
7. When I apply the Hyper Glow Serum, it has a slight tingle/stinging feeling, why is that?
8. Are these products vegan and cruelty free?