There are many reasons to take a higher dose if you want to. For instance if your diet is primarily vegetarian see bolded below, if you're getting less amounts of meat and more of veggies see bolded thus not getting enough protein in your diet, if you have disease of course, and also there's the bolded stating there is no harm in taking more.
I do believe that you are right that the upper 15-20 dose is primarily for disease. I don't see harm going to 9 grms. I didn't post that article, but it states the same thing about being able to take more and as chlorella is a pure food there's no risk of higher amounts being toxic.
As for me I mentioned earlier I have thyroid disease. Probably why that other detox I did last year killed and I mean it was awful. I have Grave's which is an autoimmune thyroid disease and was given radioactive iodine (which I should not have taken but I was listening to my doctors only to find out there was alternatives) which then caused hypo thyroid and a list of other symptoms. So I may go up to the 15-20 gram dose myself.
In addition regardless of what you take after determining what symptoms (etc), you should DEFINITELY scale back down via what MUSE says because you have to go to the maintenance dose when your body is balanced (and you're getting the effect you want to). There should not be a need to take more after that.
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How much should I take per day?
Three to four grams per day is a good maintenance dosage of Chlorella for a person to take. With this amount, you will not notice significant changes, and your body will get many of the nutrients it must have to function properly such amino acids (protein), vital minerals, vitamins, carbohydrates and enzymes.
However, a person taking 5-7 grams per day is quite common and at this level you will notice significant changes in digestion, energy and overall health. At higher dosages such as 10-12 grams per day, a person could stop eating meat and feel confident that they were getting an adequate amount of protein and other necessary nutrients that meat provides.
http://www.chlorellafactor.com/chlor...rulina-30.html
Chlorella
Disease-fighting dose: 10 grams / day
Maintenance dose: 5 grams / day
Upper limit:
there is no upper limit, but introduce chlorella into your diet gradually and monitor your stools. Since chlorella can result in mild diarrhea in some persons, introduce it slowly. (Your body will adapt over a period of a few weeks, allowing you to take more.)
Once again, most people take far too little of these foods. I've seen people take two tiny tablets of chlorella -- about 300mg -- and declare they've "taken my chlorella for the day!" That's like eating one bite of broccoli and expecting to receive the full health benefits of broccoli.
In order to be effective, you've got to take the much larger doses mentioned above. If you buy chlorella in tiny tablets, as it is often sold, that means taking a handful of tablets with each meal. Here's a tip: don't count out the tablets every single time. Count them once so you know what five grams looks like. After that, just grab a handful and toss it down your throat. It doesn't matter if it's off by a few tablets. Remember: these aren't drugs. You don't have to be exact about it, just make sure you're getting at least the doses mentioned above.
There's no harm in taking more, of course. Aside from the health benefits I've described here, the main thing you'll notice is that your stools will turn green. This is an indication that you're getting a good dose of chlorella into your diet.
If your stools aren't green, you aren't taking enough.