Top Apps to Track Micronutrient Intake
App guide
Ranked & compared
Cronometer is the only consumer app that tracks 80+ nutrients (vitamins, minerals, amino acids, fatty acids) from lab-verified data on its free tier — there is no close second for micronutrient depth.
Micronutrient tracking covers vitamins (A, C, D, E, K, B-complex) and minerals (iron, calcium, magnesium, zinc, potassium, iodine, selenium). For most people on normal caloric intake this is optional. For GLP-1 users whose food intake drops sharply, it becomes functionally necessary — reduced variety and volume mean common deficiencies (iron, B12, vitamin D, calcium) can develop within months.
This is general nutrition and wellness information, not medical advice. If you're on a weight-loss medication or managing a health condition, confirm specifics with your clinician.
What you're actually tracking
Micronutrient tracking covers vitamins (A, C, D, E, K, B-complex) and minerals (iron, calcium, magnesium, zinc, potassium, iodine, selenium). For most people on normal caloric intake this is optional. For GLP-1 users whose food intake drops sharply, it becomes functionally necessary — reduced variety and volume mean common deficiencies (iron, B12, vitamin D, calcium) can develop within months.
How we evaluated them
Evaluated on: number of nutrients tracked; data source quality (lab-verified vs. user-submitted); nutrient coverage on free tier; platform availability; and specific relevance to GLP-1-driven intake reduction and deficiency risk.
The apps, side by side
No single app wins for everyone — each card calls out who it's genuinely best for, so you can pick on fit, not hype.
Cronometer
Free / Gold $49.99/yr (about $8.99/mo)iOS / Android / WebBest for: The most thorough consumer micronutrient tracker
- Tracks 80+ nutrients (vitamins, minerals, amino/fatty acids) with lab-verified data on the free tier
- Logging is slower than photo-first apps
MacroFactor
$11.99/mo / $71.99/yr (no free tier; 7-day trial)iOS / AndroidBest for: Micronutrients plus adaptive calorie coaching
- Verified food data
- Micronutrient tracking included
- No free version
- No recipe URL import
MyFitnessPal
Free / Premium $19.99/mo or $79.99/yriOS / Android / WebBest for: Basic vitamin/mineral totals within general logging
- Covers common micronutrients
- 20.5M+ food database
- Fewer nutrients than Cronometer
- User-submitted accuracy issues (37% of popular entries had >20% energy errors in a 2024 study)
Why Micronutrient Tracking Becomes Critical on GLP-1 Medications
When semaglutide or tirzepatide cuts your daily intake to 1,200–1,400 calories, hitting protein and fiber targets often takes all your attention — but vitamins and minerals quietly slip through the cracks. A diet that looks adequate on a macro level can still leave you short on iron, B12, vitamin D, calcium, and magnesium within weeks.
The May 2025 multi-society Advisory from the ACLM, ASN, OMA, and The Obesity Society flagged nutrient adequacy as a core concern during active GLP-1 weight reduction. The logic is straightforward: you're eating less food, so you're taking in fewer total micronutrients, and the foods you do eat may be less varied than before.
Common patterns we see in GLP-1 users: red meat intake drops sharply (iron and B12 take a hit), dairy often decreases (calcium and vitamin D suffer), and leafy greens or nuts — high-volume foods that feel filling — get deprioritized when appetite is low (magnesium and folate gaps appear). These aren't theoretical risks; they show up in clinical practice within 3–6 months of significant calorie restriction.
Blood tests remain the only way to confirm a deficiency, but dietary tracking serves as an early-warning system. If your app shows you consistently hitting under 50% of the RDA for iron or calcium, you can adjust your food choices or discuss supplementation with your prescriber before symptoms like fatigue, brain fog, or muscle cramps set in.
Bottom line
The May 2025 multi-society Advisory highlights nutrient adequacy as a core concern during active GLP-1 weight reduction — food tracking is the first-line check.
Cronometer vs. MyFitnessPal vs. MacroFactor: The Real Micronutrient Comparison
The difference between these three apps isn't subtle — it's a chasm. Cronometer tracks over 80 micronutrients on its free tier using lab-verified data from the NCCDB, USDA, and other research-grade databases. MyFitnessPal covers roughly 15 vitamins and minerals, and its data comes largely from user submissions, which a 2024 study found had significant error rates. MacroFactor sits in the middle with verified data and solid micronutrient coverage, but you'll pay for it.
Here's what the numbers actually look like: open Cronometer's free version and you'll see vitamin A, C, D, E, K, thiamin, riboflavin, niacin, B6, folate, B12, pantothenic acid, biotin, choline, calcium, copper, iron, magnesium, manganese, phosphorus, potassium, selenium, sodium, zinc — plus amino acid profiles and fatty acid breakdowns. MyFitnessPal's free tier shows you a handful of these, and even Premium doesn't approach Cronometer's breadth.
Data source quality matters enormously for micronutrients because small errors compound. If a user-submitted entry for spinach is off by 30% on iron content, and you log it daily, your weekly iron total could look fine when you're actually deficient. Cronometer and MacroFactor both pull from curated, lab-analyzed databases — every entry is verified. MyFitnessPal's green checkmark system helps, but the underlying data is still crowd-sourced.
The paywall question: Cronometer's free tier gives you the full 80+ nutrient panel. Gold ($49.99/year) adds soluble vs. insoluble fiber breakdowns, advanced diary features, and PDF exports. MyFitnessPal Premium ($79.99/year) unlocks some additional micronutrient views but still doesn't match Cronometer's free tier on nutrient count. MacroFactor ($71.99/year after a 7-day trial) includes micronutrients as part of its package, but there's no free option at all.
- Cronometer free: 80+ nutrients, lab-verified data
- MacroFactor paid: verified data, solid coverage, no free tier
- MyFitnessPal free: ~15 nutrients, user-submitted data with known accuracy issues
Bottom line
Cronometer's free tier covers more micronutrients than MyFitnessPal Premium — it's the default choice if micronutrient completeness is your goal.
The Nutrients GLP-1 Users Are Most Likely to Miss
Not all deficiencies are equally likely. Based on the eating patterns that emerge on GLP-1 medications, five nutrients deserve special attention: iron, vitamin B12, vitamin D, calcium, and magnesium. Each has a specific mechanism for why it drops, and each has consequences that can be mistaken for medication side effects.
Iron deficiency is the most common we see. When appetite suppression reduces red meat and organ meat consumption — the richest heme-iron sources — total iron intake plummets. Plant iron (non-heme) is poorly absorbed (2–20% vs. 15–35% for heme iron), so simply swapping in spinach doesn't fix the gap. Symptoms like fatigue, cold intolerance, and shortness of breath overlap with GLP-1 side effects, making it easy to miss without tracking or labs.
Vitamin B12 follows a similar pattern. It's found almost exclusively in animal products — meat, fish, eggs, dairy — and fortified foods. When total food volume drops and animal protein intake decreases, B12 status can decline within months. Unlike iron, B12 stores last longer, so deficiency may not show up for 6–12 months, but the neurological symptoms (tingling, balance issues, cognitive fog) are serious and sometimes irreversible.
Vitamin D deficiency was common in people with obesity before they started GLP-1 therapy, and weight loss doesn't automatically correct it. Few foods naturally contain vitamin D (fatty fish, egg yolks, UV-exposed mushrooms), and if dairy intake drops, fortified milk disappears from the diet. Add reduced sun exposure — common when energy is low — and vitamin D status can worsen during active weight loss.
Calcium and magnesium round out the high-risk list. Calcium intake often falls when dairy consumption decreases (cheese feels heavy, milk is filling). Magnesium is lost through the GI side effects some GLP-1 users experience, and dietary sources like nuts, seeds, and legumes may be avoided due to their high fiber and fat content triggering nausea or early satiety.
- Iron: drops with reduced red meat intake; fatigue is the hallmark symptom
- Vitamin B12: requires animal products; neurological symptoms can be permanent if untreated
- Vitamin D: deficiency often predates GLP-1 use; few food sources exist
- Calcium: falls when dairy intake decreases
- Magnesium: lost through GI side effects; nuts and seeds may be hard to tolerate
Bottom line
Vitamin D and B12 don't appear in many plant foods, and both are commonly low in people who were overweight before GLP-1 therapy — track and supplement if confirmed low.
How to Read Your Micronutrient Report in Cronometer
Cronometer's Summary screen is the most information-dense nutrition dashboard available to consumers, and it's worth learning to read it correctly. The color-coded bars aren't just decorative — they're your early-warning system.
Green bars mean you've hit 100% or more of the Daily Recommended Intake (DRI) for that nutrient. Yellow bars indicate 50–100% — you're getting some, but not enough to be confident. Red bars mean under 50% of the DRI, and these are the ones that deserve immediate attention. A single red bar on one day isn't a crisis, but the same nutrient showing red across a full week is a pattern worth acting on.
The most useful feature for GLP-1 users is the custom date range. Instead of looking at a single day — which can be misleading if Monday was unusually low-calorie but Tuesday was normal — set the range to 7 days and view the averages. This smooths out daily variation and gives you a truer picture of your typical intake. If your 7-day average for iron is at 45% of the DRI, that's actionable.
Cronometer's Oracle feature (available on the free tier) suggests foods to fill specific nutrient gaps. If your calcium is low, it might recommend a serving of Greek yogurt or fortified plant milk. These suggestions are based on your actual logged intake, not generic advice. For clinician visits, Gold subscribers can export a PDF diary directly; free-tier users can use the web app's print function or screenshot the Summary page to share with their prescriber.
Bottom line
A week-long average is more useful than a single day's micronutrient report — Cronometer lets you set custom date ranges; share the 7-day PDF with your prescriber if you suspect a deficiency.
When Food Tracking Isn't Enough: Supplementing the Gaps
Food tracking identifies gaps — it doesn't fill them. Once you've confirmed a pattern of low intake for specific nutrients, the question becomes: food first, supplements second, or both? The answer depends on how large the gap is and whether you can realistically eat enough of the right foods given your appetite level.
For GLP-1 users consistently eating under 1,400 calories per day, a basic daily multivitamin is a reasonable insurance policy. It won't correct a clinical deficiency — the doses in multis are too low for that — but it prevents mild insufficiencies from becoming problems. Look for a multi that provides 100% of the DRI for B12, vitamin D, iron (if you're menstruating), and magnesium.
Targeted supplementation makes sense when tracking shows a persistent, specific gap. Vitamin D3 (1,000–2,000 IU daily) is the most common add-on — it's inexpensive, well-studied, and deficiency is widespread. Magnesium glycinate or citrate (200–400 mg) can address both dietary shortfalls and the muscle cramping some GLP-1 users report. B12 (1,000 mcg sublingual or oral) is worth considering if your animal product intake is very low.
What to flag to your prescriber: any red-bar nutrient that stays red across two consecutive 7-day tracking periods; symptoms that could be deficiency-related (fatigue, tingling, muscle cramps, hair thinning); and any supplement you start on your own. Some supplements interact with medications or affect lab results, and your prescriber needs the full picture to interpret your bloodwork correctly.
- Multivitamin: covers mild insufficiencies; won't fix clinical deficiencies
- Vitamin D3: 1,000–2,000 IU daily; inexpensive and evidence-backed
- Magnesium glycinate/citrate: 200–400 mg; helps with dietary gaps and muscle cramps
- B12: 1,000 mcg if animal product intake is very low
- Always tell your prescriber about supplements you're taking
Bottom line
A basic daily multivitamin plus vitamin D and magnesium covers the most common gaps for GLP-1 users who don't want to analyze every nutrient — but blood tests remain the only way to confirm deficiencies.
What most pages leave out
Tracking micronutrients in an app is not a substitute for blood testing — many deficiencies are silent until a lab finds them, and databases don't capture bioavailability differences (e.g., plant iron absorbs at 2–20% vs. heme iron at 15–35%). Competitors often present micronutrient tracking as a complete solution; it is a useful early-warning tool, not a diagnostic test.
We flag this so you can make an informed choice — not to scare you off.
❓Frequently Asked Questions
Cronometer is the best consumer app for micronutrient tracking — it covers 80+ nutrients including vitamins, minerals, amino acids, and fatty acids from lab-verified databases, all on the free tier. No other app matches this breadth without a paid subscription.
MyFitnessPal tracks common vitamins like C, D, and A plus some minerals on its free tier, but covers far fewer nutrients than Cronometer. Its food database also relies heavily on user-submitted entries, which a 2024 study found had significant accuracy issues — 37% of popular entries had energy errors exceeding 20%.
Iron, vitamin B12, vitamin D, calcium, and magnesium are the most frequently reported gaps in GLP-1 users. These deficiencies stem from reduced total food volume, lower animal-protein intake, decreased dairy consumption, and GI side effects that can deplete magnesium.
No — food tracking is an early-warning system, not a diagnostic tool. Many deficiencies are silent until a lab finds them, and databases don't account for bioavailability differences. Use tracking to identify potential gaps, then verify with blood tests ordered by your prescriber.
Yes — Cronometer's free tier includes the full 80+ nutrient panel with vitamins, minerals, amino acids, and fatty acids. The Gold upgrade ($49.99/year) adds soluble vs. insoluble fiber breakdowns, advanced diary features, and PDF export capability for sharing with your clinician.
MacroFactor tracks a range of micronutrients alongside its adaptive calorie coaching, using verified food data rather than user submissions. It doesn't publish an exact nutrient count, but confirmed features include common vitamins and minerals. There is no free tier — pricing starts at $11.99/month after a 7-day trial.
A basic daily multivitamin plus vitamin D and magnesium covers the most common gaps for GLP-1 users eating under 1,400 calories per day. However, discuss this with your prescriber — some people need targeted supplementation based on bloodwork rather than a general multi.
Cronometer Gold subscribers ($49.99/year) can export a PDF diary directly from the app. On the free tier, use the web app's print function or take screenshots of the Summary page showing a 7-day date range — this gives your prescriber a useful snapshot of your typical micronutrient intake.
Medically reviewed by
Chet Tharpe, MDBoard-certified physician
Last reviewed July 2026
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Read moreOn a GLP-1, or thinking about one?
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This content is for general informational purposes only and is not medical or nutritional advice, a diagnosis, or a substitute for professional judgment. It does not account for your health, medications, or goals, and nutrition information changes over time. Always talk with a qualified clinician or dietitian before making significant changes to your diet, supplements, or medications. Curex offers compounded GLP-1 medications through licensed clinicians and does not sell or endorse the food or supplement reviewed on this page.