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There are lots of factors that come into play as far as vitamin D is concerned. Vitamin D is fat soluble, this means any excess is stored in your fat. Meaning you should get annual blood work done to ensure you are taking an adequate amount. It also means the more body fat you have, the more D3 you need to take in order to get enough extra in your system. Physical activity also plays a roll in the amount of D3 you need to supplement, as does genetics.
This video has a nice little break down of D3 supplementation. Dr. Rhonda Patrick has done a number of videos and interviews talking about vitamin D. If you want to check her stuff out.
Many factors can affect absorption and distribution of D3 including age, body weight, exercise, nutritional intake, quality of D3 supplements, when or how it’s taken, and others. Best approach imo is to stick to recommended guidance on whatever suppleme taken and ask your MD to run labs after several months to see where your levels are really at after supplementing. I’ve done this for myself and other patients and found that levels may be much lower than expected when supplementing due to one or more of the factors listed herein. Daily allowances are an average and actual required intake will often vary from person to person for many of the reasons cited so its best to see where your levels are at (before and after supplementing would be even better).
I read you should not take more than 4000ui a day. I don’t know if that takes into account food you’ve eaten, so personally I don’t take anymore than 2000iu
I advise you to ditch the multi and only take vitamins you are deficient in. Otherwise you’re just taking extra vitamins for no reason, and it can cause issues if you take too much of some things. Including vitamin d