3->For external use it does not have to be food grade.
Moreless alkalizing baths and shower protocols use regular 3% h2o2.
Personally, I would make my own 3% from food grade h2o2.
4->For internal use, all articles I read do not recommend the use of pharma grade. It has to be diluted Food grade. Bill Munro use phama 3% in his inhalation method. However, I would prefer to use a 3% solution made with food grade H2O2 if it is available.
For dosages please read the Dosage section.
Where to buy? It depends on the country. See the Where to buy section below.
In the alternative health field, the maximum is actually 0.5% concentration. Actually and optimum H2O2 concentration was first determined in 1950s by Dr. Reginald Holman by implanting Walker 256 adenocarcinoma tumours. The drinking water for the rat used H2O2 optimum concentration needed to kill the tumors were about 0.45 percent.
Tumors completely disappeared in 15 to 60 days in rats. Of course a better way is to add 1/4 teaspoon of baking soda in the glass of 0.45% concentration of H2O2. This can be extended to treatment of almost any kinds of conditions, from virus, bacteria, microbial infections, pneumonia, tuberculosis, flu, etc. My own experience of using just baking soda (also increases the body's oxygen) and ascorbate vitamin C about three weeks for a small tumor to go into remission.
A more effective I think in the future of peroxide therapy is to add baking soda to the 0.45% concentration to normal drinking water since baking soda is alkaline and increases oxygen, while the peroxide furthers this natural increase.
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Hydrogen Peroxide - Curse or Cure? by Dr. David G. Williams