Banana Protein

I've read in an article that a protein in bananas, called Banlec, may help kill viruses.

Banlec could be helpful because it [I removed this because it feel redundant] may be able to cure viral infections, such as HIV/AIDS or Influenza.
It also might be able to  could then ["might be able..." two sentences in a row is too much] reduce the numbers of AIDS deaths and orphans of parents with AIDS.

But it's not so simple [ Not so simple as what? "it's not so simple" implies comparison with something, usually something you just said.].
You can't benefit from the protein if we just eat simply by eating bananas.
According to the article, you need a very high dose of the refined protein, Banlec, for it to be effectivenew and improved version of it ["It" is unspecific. Also, "new and improved version" of something is never really applied to living things] 
It seems to take a very long time to improve its effect. [Not sure what you mean. I would strike "improve its effect" and say something else. What takes a long time?]