Replied by Ted (Bangkok, Thailand)
Would I apply it to my scalp or would I drink it internally
I would likely to do the external application first for a couple of weeks. If not just maybe once a week one pinch of borax (1/16 teaspoon) in a liter of water (since our body needs boron anyway.
don't seem to need to take much, only 2 tbsp. once a day.
Actually the maximum general dose (not the optimum) is 1/2 teaspoon of baking soda in 1/2 glass of water taken twice a day. If you taken 2 teaspoon that could be quite close to getting a loose stool.
Loose stools may cause diarrhea, but if you dilute enough of those in water, the concentration will reduce and the diarrhea don't happen. For example if 2 teaspoon that appears to be closer to 1/2 glass = 1/2, which means a 2 teaspoon will be diluted in 2 glasses of water (it's four times the dose or 4 x 1/2 = 2).