Is it safe to buy vitamins from Costco?

I'm curious about the safety of purchasing vitamins from Costco. As a consumer, I'm always looking for ways to save money while still getting quality products. But when it comes to supplements, I want to be sure they're SAFE and effective. So, can you tell me if buying vitamins from Costco is a safe and reliable option? Are the vitamins they sell of good quality, and do they meet industry standards? I'd also like to know if there are any concerns I should be aware of before making a purchase. Thank you for your help!