Eventually I would like to try oral DMT. To this end, I extracted the alkaloids from syrian rue using the tao sequence (make tea, basify, keep solids, acidify, keep liquid, salt, make crystals, rehydrate, start over...). When I did this I kept some in freebase form and some in salt form. During the extraction process everything went just like in the instructions. So, anyway, I decided to first experiment with the harmala alone to find out how much I can take and what it will do. Long story short, I have tried up to 250 mg of the salt form and I haven’t felt anything. No nausea, no tracers, no nothing. So what are the possible explanations here?

-I somehow screwed up the extraction and what I have is inert (but still tastes like shit)
-I extracted it correctly but after a year or so it degraded
-I am one of those people who need a higher dose than the average
-It is actually doing what it’s supposed to do, I just don’t have any side effects

What say you? Thanks in advance.

It's probably okay. Provided your crystals are orange needles and not white cubes
250mg of mansked harmalas is a little light for me to get substantial side effects if no DMT is mixed in, I'd have a hard time telling 200mg from 250. Taking it with DMT seems to amplify the side effects of the harmaline in the harmalas and with even a light dose of DMT I can easily tell apart a 200 and 250 mg harmalas dose.
You're next step is to decide how brave or how cautious you are when choosing the dose of harmalas and DMT or bark to start with.

Thanks. What would be a light dose of freebase DMT to start with? 25 mg?

That seems to vary a lot from one person to another, even in traditional brews. Some guys would make a brew with 20mg while others would make one with 200mg

I prefer the 180-250mg range dosed after THH and half a gram of isolated harmine [not manske rue extract], personally, but on mushrooms I prefer 7 grams and do 12 to go deep and on mescaline•HCl I like 750mg so I may be a bad example for any but hardcore trippers

If you're not in a rush 25mg would be a good experience level for future reference regardless if its what you want or well below that. You might be one of the lucky ones that is really sensitive. If you are in a rush, perhaps start at 50mg.
When I started, before moving on to chemically refined DMT for my brews, I decided to catalog my reactions to everything from just above threshold to a near overdose of ACRB, I began with 2 grams and in time got to 20 grams. Then when I added THH to the dosing schedule with 8 grams ACRB it surprised me by doubling the potency
Few people could handle the universe exploding on their first pharma trip so its good to start mild to moderate and learn the new world.
So, yeah, 25mg for a light dose probably wouldn't shock you.