hi ellie in some places nutritionists and RDs hold the same status. where i am, anyone can call themselves a nutritionist (there is no mechanism for registration) while RDs are Registered Dietitians with x amount of relevant education etc.
re your shared info, if 9000 IU per day of supplemental d3 readily gets you up to 40 ng/dl of serum 25(OH)vitd3 then you can ease off. your daily sunshine routine should be enough once there, esp if you have enough dietary mag in the picture. worth monitoring. we need adequate mineral status, particularly magnesium, to utilize vit d3 via oral sources or cutaneous synthesis. be careful if you continue high dosing d3; researchers are only just starting, intermittently, to look at things other than calcium when assessing high dose oral d3 intakes. to date 'long term' studies of such intakes, other than a handful of case studies, don't exceed 6 months' duration.
it's only mag oxide that creates gi symptoms, due to its inorganic, insoluble form and associated poor absorbability. often when i go looking for my fave mag glycinate, i'll get shown mag bisglycinate but i know i don't personally handle that form well. straight magnesium glycinate does the trick for me. depending on the brand it can cost $20-$50 for the brands i prefer. in terms of the actual product i like best, i stick with the $20 version.
as for timing. it's best to always take some mag at the same time as d3. then take a separate mag dose to ensure your body gets what it needs without having the d3 drawing on that input for its own purposes.
re max magnesium per day, it varies whether you're talking from food and fluid sources, whether there are magnesium depleting factors in the mix, which include exercise, and supplement sources as well. for food and fluid and supplement intakes combined, you're looking for 7-10mg/kg body weight per day. full cup servings of boiled and drained spinach and swiss chard, 1/4c servings of pumpkin seeds and cashews, 1c servings of black beans, these all make solid 100-150mg ballpark contributions to daily mag intake. personally with a high mag diet (which coincidentally adds loads of calcium) i can only tolerate one magnesium glycinate pill (180mg elemental mag) per day. beyond that leg muscles get sluggish.
i would never take more calcium than magnesium personally. i did try to take calcium for a while but it made my back hurt. beyond diet, when it comes to supplementing i prefer taking magnesium, which ups serum d3, which in turn aids calcium absorption from dietary sources.
b complex and c look fine. hopefully you can find a multi product including minerals that you can tolerate, to help avoid driving anything out of balance. i personally use a product that involves 3 normal size powder caps per day to reach the stated daily serving size on the label. ie AOR multi basics-3. beyond that, omega 3 fatty acids - i havent been eating much high quality fish lately, need to get back in the habit :S
re labs, nutrients look decent, potassium could potentially be a bit higher, ferritin looks great. would be better, in terms of being sure you did not match an ms patient profile, to be sure of high normal serum magnesium and high normal serum zinc.
glad to hear your symptoms are somewhat better, hope that continues

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