Most people take supplements they don't need. Find out what you actually lack.

Most people take supplements without knowing if they need them. Blood testing reveals actual deficiencies in vitamin D, B12, iron, magnesium, and other nutrients. Testing before supplementing prevents overdosing on nutrients you don't lack and identifies hidden deficiencies.

Why Test Before Supplementing

Over 50% of supplement users don't need what they're taking. Without testing, you're guessing.

  • Avoid wasting money on supplements you don't need
  • Prevent toxicity from fat-soluble vitamins that accumulate
  • Target real deficiencies instead of perceived ones
  • Know exactly what dose you need, not a generic recommendation

Common Deficiencies We Detect

  • Vitamin D. 42% of Americans are deficient. Indoor lifestyles and sunscreen use are primary causes.
  • Vitamin B12. 15% of adults over 60 are low. Vegetarians and vegans are at higher risk.
  • Iron/Ferritin. Especially common in women of reproductive age and endurance athletes.
  • Magnesium. 68% of Americans are below optimal levels. Affects sleep, muscle function, and stress response.
  • Omega-3 Index. Most Americans have suboptimal omega-3 levels, impacting heart and brain health.

Supplements That Need Monitoring

Some supplements can accumulate in your body and reach harmful levels if taken without testing.

  • Vitamin A. Fat-soluble, can cause liver damage at high levels.
  • Iron. Excess iron causes oxidative damage. Only supplement if testing confirms deficiency.
  • Vitamin D. Levels above 100 ng/mL can cause calcium buildup and kidney problems.
  • Calcium. Excess calcium may increase cardiovascular risk.

Reading Your Nutrient Levels

Your results fall into five categories:

  • Deficient. Below the range where symptoms and health risks increase.
  • Insufficient. Below optimal but not yet causing obvious symptoms.
  • Sufficient. Within the standard reference range.
  • Optimal. Where your body functions at its best.
  • High. Above optimal, may need monitoring or dose reduction.

Personalized Recommendations

Your blood test determines what you specifically need. No supplement is universal. Most people benefit from vitamin D and omega-3s, but optimal doses vary. Some people need B12, iron, or magnesium; others don't.

Retest to Track Progress

Retest 3 to 6 months after starting supplements to see the full effect. Water-soluble vitamins like B and C show changes within days. Fat-soluble vitamins like D, A, E, and K take weeks to months.

The Rite Aid membership includes two full panels per year, perfectly timed for before-and-after supplement tracking.

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Supplements & Nutrition FAQ

Test vitamin D, B12, ferritin or iron stores, folate, and magnesium. These are the most commonly deficient nutrients and have the biggest impact on energy, mood, and health. The Rite Aid panel includes all of these.

Blood testing is the only reliable way. Symptoms of deficiency overlap with many conditions. You may feel fine and still be deficient, or have symptoms unrelated to nutrient levels. Test, don't guess.

Yes. Vitamin D is fat-soluble and accumulates in your body. Levels above 100 ng/mL can cause calcium buildup and kidney problems. This is why testing matters before and during supplementation.

Vitamin D deficiency affects 42% of American adults. Modern indoor lifestyles, sunscreen use, and living at northern latitudes all contribute. Most people need to supplement, but the right dose varies.

Water-soluble vitamins like B and C show changes within days. Fat-soluble vitamins like D, A, E, and K take weeks to months. Retest 3 to 6 months after starting supplements to see the full effect.

For baseline testing, stop supplements 3-7 days before to see true levels. For monitoring effectiveness, take supplements as normal. Follow the instructions in your appointment confirmation.

RDA, or Recommended Dietary Allowance, prevents deficiency diseases. Optimal levels support peak function and longevity. For example, vitamin D RDA prevents rickets at 20 ng/mL, but 50-80 ng/mL is better for immune function.

Yes. Testing before and after supplementation shows whether your levels improved. If a supplement isn't raising your blood levels, you may have an absorption issue or need a different form.

Not always. What matters is the form, like methylated B12 vs cyanocobalamin, the dose, and third-party testing for purity. Some cheap supplements work fine. Some expensive ones are worthless. Blood testing reveals which actually work for you.

No supplement is universal. Most people benefit from vitamin D and omega-3s, but optimal doses vary. Some people need B12, iron, or magnesium; others don't. Your blood test determines what you specifically need.

Still got questions?

Our team is here to help. Call us at 863-270-9911 or email [email protected]