Let’s say I’m vegan and I need to take vitamin B12 supplements to be healthy. Furthermore, let’s say I have ADHD, I forgot to take them for a month, I feel like shit, and while I know to take them now, there’s no guarantee I’ll remember tomorrow.
If I were to take 2 tablets today, an amount which I surely need, would my body actually absorb all the B12 it needs, or would I piss out the second tablet? Do I have to wait until tomorrow to absorb the nutrients my body needs now?
To add to this: I went to the doctor after a nerve injury and asked whether taking B supplements would help with recovery. She said "no, No, NO please don’t take any extra B supplements because your levels are already fine. I’ve seen enough patients come with unexplained burning, tingling and twitching sensations in their bodies and it’s always because they take B supplements unnecessarily. So don’t even think about it "
So yes our bodies can filter a lot but even then it’s also possible to overdose. Doesn’t seem to be OPs case though.