Medical school is a memory sport. Third year specifically demands that you retain enormous volumes of clinical information and recall it instantly during rounds when an attending asks you a question designed to test whether you actually read last night. I started magnesium L-threonate in combination with lion's mane mushroom (1,000mg fruiting body extract) at the beginning of my internal medicine rotation.
I want to be clear about my biases: I was taking two supplements simultaneously, sleeping better because of the magnesium, exercising consistently, and highly motivated by the clinical environment. Isolating the effect of any single variable is impossible.
That said, the difference in my study efficiency was noticeable starting around week 3. I use Anki (spaced repetition flashcards) for board prep, and I track my daily retention rate. In the month before starting the stack, my average mature card retention rate was 88.4%. In the second month of supplementation, it climbed to 92.1%. This is a meaningful difference over thousands of cards — it means fewer forgotten concepts, fewer cards needing re-review, and more efficient study sessions.
During rounds, I found myself recalling patient details more readily — lab values, imaging findings, medication lists. Whether this was the magnesium, the lion's mane, the better sleep, or simple confidence, I cannot say. My attendings commented on my preparedness more than once.
The sleep effect has been the most unambiguous benefit. Clinical rotations destroy sleep — you are up early, stressed, and your schedule changes weekly. Despite this, my sleep quality on the Magtein has been the best of my medical school career. I fall asleep within 10 minutes of lying down (previously 20-30) and wake feeling more restored.
Downsides: the cost is not trivial on a student budget. I spend about $45/month on the Magtein alone. And I genuinely cannot tell you whether it is the magnesium, the lion's mane, or the combination producing the cognitive effects. But I am not willing to remove either from my stack to find out, because whatever is working, I need it to keep working until boards are over.