'Benchmark' Thyme is absolutely the most wonderful antibacterial oil in existence. It's chemical complexity makes it very 'broad spectrum'.
If you'd like to mix something with it...and I say this because I have not seen studies on C-diff itself, I would recommend our PuriFy blend...I'd thought about straight Oregano, but it's too overpowering for diffuser use...PuriFy is a tried-and-true antibacterial formula, and smells nice at the same time...
Go for 1/2 Benchmark Thyme, 1/2 PuriFy blend - Or really up to 100% Benmark Thyme - it's really phenomenal all by itself.
Email me directly if you'd like more assistance at Eric@anandaapothecary.com
All the Best,