the rule of thumb is that if you supplement one thing you stand a chance of making yourself deficient in one or more other things. i have read reports of people being overdosed with omega 3's. one has to have the right balance of 3, 6 and 9. hemp seed oil is almost custom made in the right ratio of each. imagine that.

i believe grape seed extract is pretty good stuff. i would be concerned about the cleanliness of the grapes - organic, etc.

Moxxor is a hyped up but pathetic form of Green Lipped Mussel Oil. It is probably one of the least potent of available oils.
EPA and DHA levels are running about one quarter of what in fact is available from the GLM. Oleic Acid is through the roof at about 25 times what it should be. The actual levels of Oleic Acid in GLM is around 2.1%, Moxxor has 52.8%. This strongly suggests use of a filler such as Olive oil, I cannot see how they can get such levels from an extraction process.
I have studied mussel oil for a number of years so I am very aware of its lipid makeup. Save your money and buy some real oil, not this rubbish