I'm not sure if this is the best, but we get human-grade Alaskan salmon oil capsules by Carlson for Kaiser - they come in capsules that we pierce with a needle and squirt on his food. I know it's a little more work than getting the kind that comes in a squirt bottle, but we like it and there are no preservatives or extra ingredients, except for the ones used to make the capsule material, which he doesn't get anyway.
Here are two places that have it -
http://www.vitacost.com/CarlsonNorwegianSalmonOil
http://www.vitaminshoppe.com/store/en/br...&ci_sku=CL-1371
Here are two places that have it -
http://www.vitacost.com/CarlsonNorwegianSalmonOil
http://www.vitaminshoppe.com/store/en/br...&ci_sku=CL-1371