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Ok...D3 should not be causing this staining unless - the color of the supplement solution is like this - but as such this looks like a staining by itself and nothing serious please.
I am happy that my interaction was helpful for you and put your mind at ease. In future you can opt me as your favorite medical expert so that you can ask me a question directly. I will be happy to help anytime.
Kind regards - Dr Sumanth Amperayani