Quest Vitamin B6 250 mg
Brand: Quest · Form: TABLET [E0155] On Market
Our assessment
The evidence shows that Quest Vitamin B6 250 mg is a high-dose supplement. While vitamin B6 is essential for health, 250 mg is well above the Tolerable Upper Intake Level. Data specific to this product’s safety and effectiveness is not available, so we rely on general knowledge of the ingredient.
How it works
Vitamin B6 acts as a coenzyme in over 100 enzyme reactions, primarily involved in protein metabolism, cognitive development, and immune function [NIH ODS]. It helps your body convert food into energy and supports red blood cell formation. The mechanism involves supporting neurotransmitter synthesis and homocysteine regulation [NIH ODS].
Safety profile
FDA received 592,059 total adverse event reports across all supplement categories. For high-dose vitamin B6, side effects can include sensory neuropathy (nerve damage) with prolonged use. Specific side effect counts for this exact product are not provided [FDA data]. High calcium intakes from other supplements can cause constipation, nausea, weight loss, and abnormal heart rhythms [NIH ODS]. Interactions include reduced absorption of bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin when taken with calcium [NIH ODS].
Our recommendation
We recommend you avoid taking 250 mg of vitamin B6 daily without medical supervision. The Tolerable Upper Intake Level for adults is 100 mg per day. Consider a lower-dose B-complex supplement instead. Always consult your healthcare provider before starting high-dose supplementation [NIH ODS].
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | Quest |
|---|---|
| Serving Size | |
| Contents | 90.0 Tablet(s) |
| Market Status | On Market |
How to Read This Label
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