The Vitamin Shoppe Dry D3 10 mcg (400 IU)

Our assessment

The evidence shows that Vitamin D is a foundational nutrient for bone health and immune function. The Vitamin Shoppe Dry D3 10 mcg (400 IU) provides a standard daily dose, which is appropriate for many adults looking to maintain healthy levels [NIH ODS].

How it works

Think of vitamin D as a master regulator — it helps your body absorb calcium for bone mineralization and supports neuromuscular relaxation and nerve signaling [NIH ODS].

Safety profile

FDA received 592,059 adverse event reports for all supplements in this category. For vitamin D specifically, data on side effects for this exact product are not available. However, high calcium intakes (which vitamin D promotes) can cause constipation, nausea, and abnormal heart rhythms [NIH ODS] [FDA data].

Our recommendation

Start with one capsule daily, providing 400 IU of vitamin D3. This is a safe maintenance dose for most adults. If you take medications such as bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, or phenytoin, take this supplement at least two hours apart to avoid absorption issues [NIH ODS].

Supplement labels contain several key sections regulated by the FDA:

• Serving Size — The recommended amount per dose. Always check this — some products require multiple capsules per serving.
• Amount Per Serving — Shows the quantity of each nutrient in the product, typically in IU (International Units), mg (milligrams), or mcg (micrograms).
• % Daily Value (%DV) — Indicates how much a nutrient in a serving contributes to a daily diet. 5% DV or less is low; 20% DV or more is high.
• Other Ingredients — Lists inactive ingredients like fillers, binders, and capsule materials (e.g., gelatin, cellulose, magnesium stearate).
• Suggested Use — The manufacturer's recommended directions for taking the supplement, including timing and dosage.

Source: FDA Dietary Supplement Labeling Guide