Thorne Research Vitamin D

Our assessment

The evidence shows that Vitamin D is a well-supported supplement, though specific data for Thorne Research Vitamin D is limited. The general RDA for vitamin D is 600 IU for most adults [NIH ODS].

How it works

Think of vitamin D as a master regulator — it helps your body absorb calcium for bone health and supports immune function [NIH ODS]. It plays a critical role in maintaining healthy bones and teeth [NIH ODS].

Safety profile

Data not available on specific adverse event reports for Thorne Research Vitamin D from the FDA data provided. General safety data indicates that vitamin D is well-tolerated at recommended doses, but toxicity can occur with very high intake [NIH ODS].

Our recommendation

Our recommendation: Start with a dose that meets the RDA of 600 IU daily for most adults, but consult your healthcare provider to determine the right amount for you based on your blood levels [NIH ODS]. Choose a reputable brand like Thorne Research for quality assurance.

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