Tincture, decoction, infusion advice needed

I've come to believe that the only way any of herbs will be effective (bioavailability issue potential) for me will be to prepare either a decoction, infusion, or tincture.

Most preferable would be a glycerine based tincture, but suspect (or have read) that the superior medium is alcohol. It is not that I don't drink alcohol, I just have an easier time with glycerine based products (less nauseating).

Can anyone give me some 411/input on the following:

1 The preparations listed above: pros and cons, Potency/efficacy comparison.

2 Best method for preparing a glycerine based tincture.

3 Can powdered herbs be used to make any or all of the above?

4 If yes - while preparing with powdered herbs, any modification or adjustment to instructions? (Most techniques I've read discuss preparation with leaves, flowers, parts/ cut/sifted herbs - not powdered.)

5 Possible to make a Master Brew using a combination of herbs - powders, leaves, flowers, etc. all thrown in the pan/container while extracting?

TIA for any random thoughts or suggestions.

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