Pickling Lime is Food Grade Calcium Hydroxide
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Pickling Lime is Calcium Hydroxide. It's also called "food-grade Lime", because in making the Calcium Hydroxide the processors make sure that the process remains pure and doesn't introduce anything untoward (e.g. it's not done in rusty old bins.)
Pickling Lime helps to improve the firmness of pickles by introducing calcium that reinforces the pectin in the vegetable being pickled. In using it, a vegetable such as cucumber is soaked first in water mixed with the pickling Lime, for up to a day, then the food to be pickled is rinsed thoroughly -- at least 3 times -- before the actual pickling process begins.
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Here are a few places where you can find it:
Some Walmart sells Mrs Wages Pickling Lime
Make you pickling lime solution by putting 1 tablespoon of the pickling lime powder in one gallon of distilled water. Distilled water is preferable because more of the powder will dissolve. Than in your drink start with one tablespoon of this solution. But before taking the tablespoon from the solution, you will find some powder in the bottom of the jug. Shake the jug so the lime will be distributed uniformly.
For your armpits, you may try to spray on them 3% H2O2 before and after a shower. H2O2 is hydrogen peroxide. It might help.