Questions about supplements for autophagy/TBI

Short version: I am limited in my fasting window to around 90-94 hours but am trying to get autophagy/BDNF. For speeding things along, I’m trying berberine, resveratrol, and turmeric (all in powder form, no gel caps) along with pipperine to help with absorption. Questions:

1. Any thoughts on the approach?
2. Should I just take the supplements the first day? I’m worried ingesting things during the fast will mess with autophagy.
3. Is there something else I should be doing? I’ve debated adding some high-intensity interval training the first day of the fast, and am considering NSAIDs to decrease inflammation to speed things along.

Thoughts?

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Longer version:

I’m fasting for 3 reasons:

1. Recover from brain injuries (concussion and chemo) that are hampering me. Brain healing is the main goal, so am focused on BDNF and autophagy.
2. Help with arthritis – either short term while fasting or more permanent changes.
3. Weight loss. This one is a distant third. My weight is (finally) within normal range, if on the high end. I could certainly stand to lose 10 more pounds though and put on some muscle.

If I were obese, I’d just fast for 30+ days (did that last summer), but that would be too much weight loss (and muscle loss). My current approach is a weekly schedule of fasting for about 3.8 days, and then feast the remainder of the week while sneaking in a couple of weight training sessions. That has led to gradual weight loss and preservation of lean tissue. It seems sustainable, but I’d like to tweak it.