Hi mother hen,
If it changes your INR they will compensate by giving you more warfarin. Unless chia seeds have a lot of Vit k, I doubt a little omega 3 will make much difference.
Now if you eat a lot of broccoli, spinage and cauliflower, that will really drop your INR below limits, because of Vit k content.
It is just essential you eat the same stuff that modifies your INR every day and then the anticoagulant clinic changes your dose appropriately .
The antidote for bleeding from a warfarin bleed is massive doses of Vitamin k.
It's a pity drugs like warfarin and statins are Vitamin k antagonists, that may be the reason why they both cause arterial calcification?
regards
Derek