We are taking this for immunity and as antioxidant, no complaints. I like it is with time release so better than other forms. For its price, this is a good deal. I believe the quality is up to standards.
These are a great value and the potency is just right. If you take more than 500mg it doesn't get absorbed. So I take one of these twice a day. I like capsules the best because sometimes tablets aren't completely absorbed.