Quest Folic Acid 1 mg Plus 1000 mcg Vitamin B12

Our assessment

The evidence shows that this product combines two important B vitamins, but the data provided does not include specific studies or health claims for folic acid or vitamin B12. Our assessment is that while folic acid and vitamin B12 are essential nutrients, you should not assume this product provides benefits beyond what is established for general nutrition. Data not available for specific health outcomes for this combination.

How it works

Think of folic acid and vitamin B12 as co-factors that work together to support red blood cell formation and nervous system function [NIH ODS]. The calcium in this product, at 1 mg, is a very small amount and does not contribute significantly to bone mineralization, which typically requires much higher doses [NIH ODS]. Calcium's primary mechanism is bone mineralization and neuromuscular relaxation [NIH ODS].

Safety profile

FDA received 592,059 total adverse event reports across all supplement categories. For calcium specifically, high intakes might increase the risk of heart disease and prostate cancer [NIH ODS]. High calcium levels can cause poor muscle tone, poor kidney function, low phosphate levels, constipation, nausea, weight loss, extreme tiredness, frequent urination, abnormal heart rhythms, and a high risk of death from heart disease [NIH ODS]. Calcium can reduce absorption of bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS].

Our recommendation

Start by checking your current folic acid and vitamin B12 intake from food and other supplements. If you are taking this product, be aware that the calcium content is minimal and not intended for bone health. For safety, take this supplement at least two hours apart from any medications listed in the interactions section. Do not exceed the recommended dose on the label. Data not available for specific dosing guidance for this combination.

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