After reading that stomach acid, due to inefficient digestion, can be controlled by using apple cider vinegar (ACV), I tried the liquid form and found that, for me, it did. After using the liquid form for a while I became concerned about the condition of my teeth - I noticed a discolouration which, as I understand can be a side effect, due to the acidic nature of ACV. After inquiring about alternatives, I came across various capsule forms of ACV and I decided on the Purolabs supplement because there are no added ingredients to bulk, etc. So far, very happy with the results and buying from Purolabs is easy and efficient. Communication is clear, concise and delivery is quick.