I started taking a multivitamin as insurance and then found out that two of the things I was actually short of were the two it barely contains.
Cheap and worth having: ferritin, B12, vitamin D. Everything else on the deficiency list is adequately covered by a standard multivitamin at ordinary doses.
So the question, as narrowly as I can put it: which deficiencies actually show up when intake drops this far, and which are worth testing rather than supplementing blind.
Happy to be told the question itself is wrong.
Admin said:I started taking a multivitamin as insurance and then found out that two of the things I was actually short of were the two it barely contains.
Iron studies on micronutrients — important especially for women:
| Marker | Baseline | Month 6 | After Supplementation |
|---|---|---|---|
| Ferritin | 58 | 26 | 53 |
| Iron | 88 | 58 | 96 |
| TIBC | 318 | 388 | 348 |
| Transferrin Sat | 34% | 18% | 27% |
My ferritin cratered at month 6 from reduced dietary intake. Iron bisglycinate 36mg with vitamin C brought it back up. Don't wait for anemia symptoms — test proactively.
Dr.CardioMD said:Iron studies on micronutrients — important especially for women: Marker Baseline Month 6 After Supplementation Ferritin 58 26 53 Iron 88 58 96 TIBC…
Blood count monitoring for micronutrients: my doctor noticed my MCV (mean corpuscular volume) trending up at month 6: 91 → 98 fL. This flagged potential B12 or folate deficiency.
Sure enough, B12 had dropped from 620 to 340 pg/mL. Started B12 injections monthly and MCV normalized within 2 months. GLP-1 agonists can impair B12 absorption — this is a real clinical concern that deserves routine monitoring.
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Browse GL BiochemAdmin said:I started taking a multivitamin as insurance and then found out that two of the things I was actually short of were the two it barely contains.
Adding a me-too, because a thread of one person's experience is not much use. Nothing to add that would improve it.
Adding the clinical framing, because it changes how the question reads.
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.