Finally got the answer from David P. Amrein - YES it is SAFE to be taken internally!
My initial questioning is because I read this below and there wasn't anything about 17.5% grade:
Hydrogen peroxide is available in various strengths and grades.
3% Pharmaceutical Grade: This is the grade sold at your local drugstore or supermarket. This product is not recommended for internal use. It contains an assortment of stabilizers which shouldn´t be ingested. Various stabilizers include: acetanilide, phenol, sodium stanate and tertrasodium phosphate.
6% Beautician Grade: This is used in beauty shops to color hair and is not recommended for internal use.
30% Reagent Grade: This is used for various scientific experimentation and also contains stabilizers. It is also not for internal use.
30% to 32% Electronic Grade: This is used to clean electronic parts and not for internal use.
35% Technical Grade: This is a more concentrated product than the Reagent Grade and differs slightly in that phosphorus is added to help neutralize any chlorine from the water used to dilute it.
35% Food Grade: This is used in the production of foods like cheese, eggs, and whey-containing products. It is also sprayed on the foil lining of aseptic packages containing fruit juices and milk products. THIS IS THE ONLY GRADE RECOMMENDED FOR INTERNAL USE. It is available in pints, quarts, gallons or even drums. Various suppliers are mentioned later in this article.
90%: This is used as an oxygen source for rocket fuel.
Thanks for all your help and input and love to hear more of your experiences with H2O2.