How do I find the expiration date on this product?

On the bottom of the box where the UPC code is

what kind of vitamin c

The SkinMedica Vitamin C+E Complex contains Ascorbic Acid and Tetrahexyldecyl Ascorbate. Ascorbic Acid is a form of vitamin C that acts as a powerful antioxidant, reducing the appearance of fine lines and discoloration and protecting the skin against free radical damage, while Tetrahexyldecyl Ascorbate is a stable form of vitamin C that promotes collagen production and minimizes the appearance of fine lines and wrinkles. LovelySkin is an authorized reseller of the SkinMedica products, and you may visit our store on Amazon to purchase this product.

How long should this product last? I've only had it for ~ 6 weeks. When I press the pump it only gives me a small amount like it is almost empty.

I’ve been using this product for at least 3 years. A small amount should be used ...probably why when you pump only a small amount comes through. Love it. Makes my skin feel like velvet! I use two per year.

Humecta profundamente la piel dandole las vitaminas necesarias. Se aplica todos los dias antes de maquillarse. Tiene una textura wie se absorbe inmediatamente. Muy recomendada!!!