Answer 2 quick questions about your diet and your biggest daily health struggle to get a personalized "Core 3" supplement recommendation you can bring to your next doctor or dietitian appointment.
Personalized Vitamin Quiz
Discover the exact core supplements your body is missing based on your lifestyle and diet.
*These statements have not been evaluated by the FDA. This product is not intended to diagnose, treat, cure, or prevent any disease. Always consult your physician before starting new supplements.
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What Your Quiz Result Means
The quiz generates a "Core 3" protocol based on two data points: your dietary pattern and your primary health struggle. Here is what each of the three recommendation cards represents, and what to do next.
The Diet Card (Card 1)
Your first recommendation reflects your food pattern. Plant-based and vegan diets are reliably low in Vitamin B12, since that nutrient is found almost exclusively in animal products. Low-carb and ketogenic diets cause faster electrolyte loss through urine, because restricting carbohydrates lowers insulin, which signals the kidneys to excrete more sodium, potassium, and magnesium. A diet heavy in processed food creates broad nutritional gaps that a high-quality multivitamin can partly bridge. Standard mixed diets typically lack enough omega-3 fatty acids, since most people consume far more omega-6 (from vegetable oils) than omega-3 (from fatty fish or flaxseed).
The Struggle Card (Card 2)
Your second recommendation targets your reported symptom. Magnesium plays a direct role in GABA receptor activity and melatonin regulation, which is why it is linked to sleep quality in clinical research. Both Vitamin B12 and vitamin D deficiencies are associated with fatigue in the medical literature. Joint discomfort is associated with inflammation, and compounds like curcumin have been studied in this context, though individual response varies considerably. These are starting points for a conversation with your doctor, not a diagnosis or treatment plan.
The Universal Card: Vitamin D3 + K2 (Card 3)
Vitamin D3 paired with K2 appears as the third recommendation for most users because vitamin D insufficiency is widespread. The NIH estimates that approximately 35 percent of US adults have insufficient vitamin D levels (below 20 ng/mL on a 25-hydroxyvitamin D blood test), and very few foods contain meaningful amounts naturally. K2 is included because it activates proteins that direct calcium toward bones and teeth rather than arteries and soft tissue, which matters when supplementing vitamin D3 long-term.
Nutrient Gaps by Dietary Pattern
Your diet is the single strongest predictor of which nutrients you are likely missing. The table below shows common gaps by eating pattern, drawn from NIH Office of Dietary Supplements fact sheets and the Dietary Guidelines for Americans.
| Diet Type | Most Likely Nutritional Gaps | Foods That Help | Quiz Recommendation |
|---|---|---|---|
| Plant-Based / Vegan | Vitamin B12, Iron, Zinc, Omega-3 (EPA/DHA), Calcium, Vitamin D | Fortified cereals, nutritional yeast, lentils, chia seeds, fortified plant milk | Vitamin B12 (Methylcobalamin) |
| Low-Carb / Keto | Sodium, Potassium, Magnesium (electrolytes lost via urine on ketogenic diets) | Avocado, nuts, salted broth, leafy greens, seeds | Electrolyte Complex (Na, K, Mg) |
| Fast Food Heavy | Vitamins A, C, D, E, Folate, Fiber, Potassium | Dark leafy greens, whole fruit, legumes, whole grains | High-Quality Multivitamin |
| Standard Mixed Diet | Omega-3 fatty acids, Vitamin D (in most adults) | Fatty fish (salmon, sardines), eggs, fortified dairy | Omega-3 Fish Oil (EPA/DHA) |
How This Quiz Works
The quiz uses a two-variable decision tree rooted in established nutritional research. Here is the exact logic behind your result.
Variable 1 (Diet Pattern)
Determines the most likely macro-level nutritional gap based on which food groups you eat, restrict, or avoid. Drawn from NIH Office of Dietary Supplements dietary gap data organized by eating pattern.
Variable 2 (Primary Health Struggle)
Maps your most pressing symptom to the nutrients most studied for that outcome: sleep quality (magnesium, via GABA regulation research), fatigue (B12 and vitamin D deficiency literature), immunity (vitamin C and zinc clinical trials), joint health (curcumin and collagen studies).
Card 3 (Universal Recommendation)
Vitamin D3 + K2 for most users. Iron Bisglycinate replaces it for users who report both immunity struggles and a vegan diet, where iron deficiency risk is higher due to the absence of heme-iron sources from animal products.
This quiz does not measure actual blood nutrient levels. It is a screening tool designed to help you identify which supplements are worth asking about at your next doctor or registered dietitian appointment.
Why Your Result Is a Starting Point, Not a Prescription
A two-question quiz based on self-reported diet and symptoms has real limitations. Before acting on your result, be aware of the following:
- No blood testing. True deficiency is confirmed by lab work, not symptoms. Vitamin D insufficiency is defined as a 25-hydroxyvitamin D level below 20 ng/mL on a blood test. Only a lab result gives you that number.
- Absorption varies by individual. Age, gut health, genetic variants (such as MTHFR for folate metabolism), and existing health conditions all affect how well you absorb any nutrient from a supplement.
- Supplements interact with medications. Fish oil has blood-thinning properties. Vitamin K2 directly affects warfarin dosing. Iron can reduce absorption of thyroid medication and certain antibiotics. Always tell your prescribing doctor what you take.
- More is not safer. Fat-soluble vitamins (A, D, E, K) accumulate in tissue. The NIH sets tolerable upper limits for a reason. Excess iron without a confirmed deficiency can cause serious harm.
- Adaptogenic herbs carry caveats. Ashwagandha and rhodiola are not recommended during pregnancy and may interact with thyroid medications and immunosuppressants. Evidence in otherwise healthy adults is promising but limited.
6 Health Numbers to Track Alongside Your Supplement Routine
Supplements do not work in isolation. Use these free tools to track the body metrics most closely connected to nutritional health.
BMI Calculator
Body composition affects vitamin D distribution. Higher body fat is associated with lower circulating vitamin D even with adequate intake or supplementation.
Blood Sugar Checker
Blood glucose levels are closely linked to B vitamin utilization, chromium status, and magnesium sufficiency in the body.
Blood Pressure Checker
Magnesium and omega-3 fatty acids both influence cardiovascular markers. Track your readings as you adjust your supplement routine.
Metabolic Age Calculator
Your metabolic health status is one of the strongest indicators of which micronutrients will have the highest impact for your specific body.
TDEE Calculator
Total daily calorie intake determines how much micronutrient exposure you get from food, and how large your supplement gap actually is.
Biological Age Calculator
Identify the gap between your chronological and biological age. Nutrient status is one of the modifiable drivers of biological aging.
Supplement Quality: What to Look For
The FDA does not approve dietary supplements before they reach store shelves. Manufacturers are responsible for safety and labeling accuracy, but no pre-market clinical trial is required. Third-party certification is the most practical quality signal available to consumers.
- Third-party certification: Look for the USP Verified mark, NSF International certification, or ConsumerLab approval. These indicate independent testing for purity, potency, and accurate labeling.
- Bioavailable forms matter: Magnesium glycinate or malate absorbs better than magnesium oxide. Methylcobalamin is the preferred form of Vitamin B12. Vitamin D3 (cholecalciferol) raises blood levels more effectively than D2 (ergocalciferol).
- Avoid hidden proprietary blends: A label showing only a total blend amount without individual ingredient quantities makes it impossible to know if you are getting a meaningful dose of anything.
- Check dosing against NIH upper limits: Verify that doses fall within the safe ranges published by the NIH Office of Dietary Supplements. Megadosing above established upper limits increases risk without improving outcomes for most people.
When to See a Doctor or Registered Dietitian
A supplement quiz is not a substitute for professional guidance. See a healthcare provider before starting any new supplement if any of the following applies to you:
- You take any prescription medications, since drug-supplement interactions are common and sometimes serious.
- You are pregnant, breastfeeding, or actively trying to conceive. Nutrient needs shift significantly, and some supplements are contraindicated.
- You have a diagnosed health condition including heart disease, kidney disease, liver disease, or diabetes.
- You suspect an iron deficiency. Do not supplement iron without a blood test confirming low ferritin or hemoglobin. Excess iron accumulation is toxic and irreversible without treatment.
- You are experiencing significant fatigue, hair loss, numbness, tingling, or persistent muscle cramps, as these may indicate deficiencies or other conditions requiring a proper clinical diagnosis.
A registered dietitian (RD or RDN) can analyze your actual dietary intake and provide evidence-based recommendations tailored to your complete health history, rather than a two-question screening tool.
Frequently Asked Questions
How does the supplement needs quiz work?
The quiz uses a two-variable decision tree. Your first answer (diet type) identifies the most likely nutritional gap based on which food groups you eat or avoid. Your second answer (health struggle) maps your primary symptom to nutrients most studied for that outcome in clinical research. The combination generates a "Core 3" protocol: one diet-based recommendation, one symptom-linked supplement, and one universal pick (usually Vitamin D3 + K2).
What vitamins should I take if I am vegan?
The most critical supplement for vegan and plant-based diets is Vitamin B12, since it is found almost exclusively in animal products. Vitamin D3 (or vegan-sourced D3 from lichen) is also commonly needed. Depending on your diet, you may also benefit from algae-based omega-3 (EPA/DHA), iron (confirmed by blood test first), zinc, and calcium. A registered dietitian can assess your specific gaps with a dietary analysis.
Is it safe to take Vitamin D3 every day?
For most adults, yes. The NIH recommends 600 IU daily for adults up to age 70, and 800 IU for adults over 70. The tolerable upper limit is 4,000 IU per day for most adults. Have your 25-hydroxyvitamin D level checked by a doctor to confirm whether you actually need supplementation and at what dose. Taking D3 paired with K2 helps direct calcium appropriately to bones rather than soft tissue.
What supplements help with low energy and fatigue?
Fatigue has many causes, so supplementation should follow testing rather than guessing. Common deficiencies linked to fatigue include Vitamin B12 (especially in vegans and adults over 50), Vitamin D, and iron (especially in menstruating women). Adaptogens like ashwagandha have shown modest effects on stress-related fatigue in some clinical trials, but should not be the first step. Ask your doctor for a basic blood panel before investing in supplements for energy.
Does magnesium actually help with sleep?
Magnesium plays a role in GABA receptor regulation and melatonin metabolism. Some studies show magnesium supplementation improves sleep quality in adults who are deficient, or in older adults with insomnia. Magnesium glycinate and magnesium threonate are generally considered the most bioavailable and gentlest on digestion. The typical supplemental dose studied for sleep is 200 to 400 mg taken before bed.
How do I know if I have a vitamin deficiency?
The only reliable method is a blood test ordered by your doctor. Common panels include 25-hydroxyvitamin D for vitamin D status, serum B12 and methylmalonic acid for B12, a complete blood count and serum ferritin for iron, and a comprehensive metabolic panel for general health. Symptoms like fatigue, brain fog, hair loss, and muscle cramps can suggest deficiencies, but they overlap with dozens of other conditions. Always confirm with lab work before supplementing.
Can supplements interact with my medications?
Yes, and this is one of the most important reasons to tell your doctor about everything you take. Fish oil can have blood-thinning effects and may interact with anticoagulants like warfarin. Vitamin K2 directly affects warfarin dosing. Iron can reduce absorption of thyroid medication and certain antibiotics. St. John's Wort interacts with antidepressants, birth control, and immunosuppressants. Always review any supplement with your prescribing physician before starting.
Are dietary supplements regulated by the FDA?
Not in the same way as prescription drugs. The FDA does not approve dietary supplements before they reach store shelves. Manufacturers are responsible for safety and labeling accuracy, but no pre-market clinical trial is required. The FDA can act after a product is found unsafe. Third-party certification from USP, NSF International, or ConsumerLab is the most practical quality signal: these organizations independently test for purity, potency, and labeling accuracy.
Sources
- NIH Office of Dietary Supplements: Dietary Supplement Fact Sheets
- Dietary Guidelines for Americans 2020-2025: DietaryGuidelines.gov
- National Center for Complementary and Integrative Health: Dietary and Herbal Supplements
- Harvard T.H. Chan School of Public Health: The Nutrition Source: Vitamins
- NIH Vitamin D Health Professional Fact Sheet: Vitamin D Fact Sheet
- U.S. Food and Drug Administration: FDA Dietary Supplements Overview
Medical Disclaimer: This quiz is for informational and educational purposes only. Results are not a diagnosis, a prescription, or a substitute for professional medical advice. Supplement recommendations from this tool have not been evaluated by the FDA. Always consult a qualified healthcare provider or registered dietitian before starting any new supplement, especially if you take medications or have an existing health condition. See our full Medical Disclaimer and Editorial Policy.
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