
I suggest this sentence be changed into:
この物質はどのように体に吸収されるのか知りたいです。
この物質がどのように体に吸収されるのか知りたいです。(sounds more natural to me)
For indirect questions we use either のか or か like these:
どうして彼が嫌いなのか説明してくれない?
どこに行けばいいのかわからない。
お昼どこで食べるか決めたの?

Thanks. Indeed subject within a matrix sentence should be が and not は. And indirect clause is always marked by か.
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This sentence was initially added as a translation of sentence #845134
added by tigro1973, August 28, 2011
linked by tigro1973, August 28, 2011
edited by tigro1973, August 29, 2011
linked by Scott, September 5, 2011