Oh. The melee weapon doesn't boost allies, just poisons enemies when they're slapped with it. The "chemical boost" is when you use your F key to...
If you're talking about the heal vial, the F key. G key throws the green, glowy healing tank.
Haha. I did that yesterday as an ork Painboy vs LSM. Only a few people on the point, but still hilarious. No one was actually watching the point....
