I've been using this product since September as my son is always sick since he started school. It has worked well and the ester c is time realized. Issues in general is a great brand. I like how it can be found at the grocery stores. It's a little more expensive than the general brands but you get what you pay for.

I love that the jars are made of glass instead of plastic, and it is royal blue, it is dark which keeps the vitamins in a dark place and keeps them dryer with glass than plastic. I am happy with any therapeutic result I have had from this Sisu Product. It is also a high dose of 600mg.

Ester-C® takes Calcium ascorbate and, using a proprietary, water-based manufacturing process, produces a pH neutral product that contains active Vitamin C metabolites (that do not exist in any other form of Vitamin C, including Calcium ascorbate).

#1 - Reason I love taking Ester C opposed to other Vitamin C supplements stated above and they are a Canadian Company
#2 - All Sisu Products are mad with the purest raw materials and uncompromising quality
#3 - All Sisu Product standards that exceed Canadian regulatory requirements.