Vitamin D optimization on GLP-1 — testing and dosing guide

Dr.Martinez said:

A sustained drop to 1,100 or 1,200 calories reliably under-delivers a predictable set: B12, vitamin D, iron, folate, zinc and magnesium.

Vitamin D levels and micronutrients: an often-overlooked connection. Obese individuals store vitamin D in adipose tissue, making it less bioavailable. As you lose fat, vitamin D can actually increase WITHOUT supplementation.

My trajectory: Baseline 18 ng/mL → Month 6 (with supplement) 42 ng/mL → Month 12 48 ng/mL. Target is 40-60 ng/mL. Adequate vitamin D supports immune function, bone health, and mood — all relevant during weight loss.

A narrower follow-up, since the general answer is now clear:

What did you change at the same time, and can you separate the two now?

Dr.RaviCardio said:

Vitamin D levels and micronutrients: an often-overlooked connection.

Adding the part of the answer the thread has not reached. It helps to say which part of this you are uncertain about. A precise question gets a precise answer; a general one gets everybody’s favourite anecdote.

Ask again with the specifics and you will get a better answer than this one.

OP back with an update, since a thread like this is useless without one.

Reporting back with a partial result, because a partial result is still better than silence. Two of the three things suggested helped; I cannot separate them and I am not going to pretend otherwise.

roxy_nash said:

It helps to say which part of this you are uncertain about.

Correct as far as it goes. The part it does not cover is what to do when the honest answer is "not enough data", which is more often than anyone likes.

If somebody has the primary source to hand I would rather cite it than paraphrase it.