It sounds like you have got SP extract as they generally come in 160 or 320 mg per capsule and the instructions on the box state that you should take 320 per day, i.e. in your case it would be two per day? What you read about 500 mg capsules must have referred to the herb itself (i.e. not extract).
The extract is fine. I am not sure though if 500 mg capsules are equal to 160 or 320 mg of extract.
The extract is fine. I am not sure though if 500 mg capsules are equal to 160 or 320 mg of extract.