Recently at Carrefore I have been able to buy cartons of eggs that advertise ingredients in them: the 3 choices that I've seen are 1) Omega 3 2) DHA 3) Selenium with Vitamin E. They come in plastic instead of cardboard and cost 10-20 Baht more than the regular cartons. Each individual egg even has a stamp on it in light pink ink. I've tried some and can detect no difference in taste. If the advertising is true, how do they do it? Or am I just wasting my money?

It is something to do with the additives in the chicken's food.

But, how do you know?

There are easier and more certain ways to add these nutrients to the diet.

Holland & Barrett ?

I think that the eggs laid by chickens who only drink Tiger beer are worth paying more for.