3 is the Magic Number

I remember this ad, mainly because I writing a post about it, but I can't put two and two together. Well actually in this case, three.

(Click the pic to play the ad, nought on YouTube I'm afraid)
The Magic Number 3
Could you tell what the advert is for?

At 17 seconds I didn't have a clue, then when it does tell you, the picture clearly has more than 3 great ingredients. Well in my opinion it has anyway.