Hello Mikael The drug is quickly absorbed in/into the bloodstream. He was so absorbed in/into his work, he hadn't realised everyone else had gone home. The cream is easily absorbed in/into the skin.
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MikaelThe drug is quickly absorbed in/into the bloodstream.If 'In" is used to mean inside something then "into" is also possible and either one or the other can be used. So for your examples I would say that the only
He was so absorbed in/into his work, he hadn't realised everyone else had gone home.
The cream is easily absorbed in/into the skin.