Do the other medic buffs like (metabolism and, speed) stack with the regular buff?

If not wouldn't it seen unnecessary to waste supplies on them, when you would want to concentrate more on healing and reviving?

Im not necessarily referring to Adrenaline boost, because that has its uses.

They stack, but speed boost is only temporary. Regeneration is permanent (until they die, of course).

Good to know. Thanks

Everything stacks with diminishing returns as I understand it.

Every successive identical buff is reduced I believe.