Geranium dissectum may contain some tannins and mildly astringent compounds, there is no strong herbal tradition or scientific support for its use.
It is sometimes listed as having mild astringent actions, but this is likely assumed based on its genus rather than tested evidence.
It’s mostly considered a weed or wild edible, not a primary medicinal plant. I’d stick with G. maculatum.
Don't use herbs or combine herbs with medications or use them during lactation or pregnancy without talking with your healthcare provider.