Blood effects come from using various consumable items created by powder pouring. Attempting to use an item that would give you a second blood effect when you already have one active does not consume the item and replaces the use text with this message:

There's enough weird stuff in your bloodstream right now. You don't think it'd be a good idea to add more.

Item Effect
acidic dust Acidic Blood
crystal dust Crystal Blood
oily dust Oily Blood
organic dust Living Blood
stimulant dust Sparkling Blood
Blood of the Ancients Blood of the Ancients (Effect)

The following may also be blood effects; more spading is needed:

Ancient Resilience

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