I got a blood test a few months ago which revealed that I was deficient in vitamin D and choline. I was also relatively low in magnesium. This test was done almost a year and a half after starting a supplement regime of 5000 IU a day of vitamin D, and ~800mg a day (400 in the morning, 400 at night) of magnesium taurate (among many other supplements), as well as having 2 eggs for breakfast every day, and generally eating pretty healthy, and trying to get a fair amount of sun (the test was in October, so presumably my vitamin D levels still reflected summer sun exposure to some extent).

First, I'm a little perplexed by this vitamin D result, given I've been supplementing for so long. What might this indicate about my ability to absorb vitamin D? Is there anything I can do to boost absorption? What effect would a deficiency in vitamin D have on my healing?

For the choline, I started taking 500mg of citicholine daily at the beginning of November (can't remember exactly when now). It was around this time that I started feeling worse symptom wise, and that's persisted till now. Could the choline supplementation cause this? I've tried stopping a few times and haven't noticed a change, so I'm doubtful, but wondered if anyone had thoughts. What would the effect of a choline deficiency be on healing? It may be that I started my PCS journey with low levels of this already, as apparently it can be low in endurance athletes, and I was a long distance runner for most of my life up until about 6 months before the concussion.