Trying to Conceive: Do all antimicrobials kill sperm? Even if it's a natural ingredient?

I've recently found a study that said that major personal lubricant brands (such as KY, Astroglide, etc.) that claim to not contain any spermicides do in fact kill sperm. In my search to find a different natural lubricant I came across several that contain natural antimicrobials (such as Lactoperoxidase). I know that many l spermicides are antimicrobial, but does that mean that anything with that property will have that same effect? I am trying to conceive and do not want this to be an inhibiting factor. Also, if you know of any lubricants that would suit my needs please suggest! Thanks!