Here in Canada where I live the most popular pharmacy is Shoppers Drug Mart, they have their own brand called Life. Their vitamin K is in a rather thick gel format that applies with a small applicator that comes in the container.
To be honest with you, all the vitamin brands will be the same, what you need to look at is the IU (international units) which represents the amount of vitamin per serving, so the high the IU the higher the dosage.
You could also attack the circles in two ways, topically and internally. Apply the gel under the eyes and eat lots of dark green vegetables to get your dosage from the inside.
Hope this helps...