Absolutely! Product Credit can be redeemed along with other rewards if you have enough Stars in your account and your subtotal is at least $25.
Promotions and rewards that can be used together include: sample promos, gifts with purchase, free shipping perks, and some promo codes. All promotions will apply to the subtotal after Product Credit is applied and deducted. Product credit can not be used towards DUOLAB or subscription items including AmazeBox. In order to use your product credit, please place a separate order just for those items.