Douglas Laboratories Liquid B12
Brand: Douglas Laboratories · Form: LIQUID, SUPPLEMENT FORM [E0165]
Our assessment
The evidence shows that this product contains calcium, a mineral essential for bone health. For adults, the recommended dietary allowance (RDA) is 1,000 mg daily for most adults, increasing to 1,200 mg for women over 50 and men over 70 [NIH ODS]. Data not available on the specific dosage of calcium in this product.
How it works
Think of calcium as a structural builder — it supports bone density and mineral deposition, which is critical for maintaining strong bones as you age. It also plays a key role in neuromuscular relaxation and nerve signaling [NIH ODS].
Safety profile
FDA received 592,059 total adverse event reports across all supplements. For calcium specifically, some research suggests that high intakes might increase the risk of heart disease and prostate cancer [NIH ODS]. High levels of calcium in the blood and urine can cause poor muscle tone, poor kidney function, low phosphate levels, constipation, nausea, weight loss, extreme tiredness, frequent need to urinate, abnormal heart rhythms, and a high risk of death from heart disease [NIH ODS]. Calcium can also reduce the absorption of several medications, including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS].
Our recommendation
Start by assessing your total daily calcium intake from food and all supplements. Do not exceed the tolerable upper intake level of 2,000 to 2,500 mg daily from all sources [NIH ODS]. Take calcium supplements with food to improve absorption. If you take any of the medications listed above, separate calcium intake by at least two hours [NIH ODS]. Consult your healthcare provider before starting, especially if you have a history of kidney stones or heart disease.
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | Douglas Laboratories |
|---|---|
| Serving Size | |
| Contents | 1.0 fl. Oz. 30.0 mL |
| Market Status | Off 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