Adding spice powder to flour

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Hi just wanted to ask 2 questions here,
1. does adding garlic and onion powder to flour when making instant yeast bread hurts the yeast or cause other problems?
2. If I puree and onion and some garlic with water in a blender and then strain the water, will that hurt the yeast or cause problems?
Thanks for any advice. 
MB

http://www.thefreshloaf.com/node/2590/garlic-and-its-effect-yeast

http://www.thefreshloaf.com/node/16802/dough-hook-kneading#comment-109121

You get lots of hits typing: garlic  into the site search box.  

On the onion front, folks seem to get more onion flavour using dried onions as opposed to fresh.  Cut up your favourite several days in advance and dry them.  Then rehydrate or incorporate dry.  All kinds of ways to be creative.  More under: bialy. 

Wow thank you Mini I am a roasted garlic fanatic and had not thought of putting that in bread. 
Maybe some deeply caramelized onions too. THANKS!