Dr. Mercola Fermented Black Garlic

Our assessment

The evidence shows that Dr. Mercola Fermented Black Garlic contains calcium [See label]. Based on the data, calcium is well-known for supporting bone health, but you need to be cautious with dosing. High calcium intakes might increase the risk of heart disease and prostate cancer [NIH ODS]. For a general audience, it is important to evaluate your total calcium intake from all sources before adding this supplement.

How it works

Think of calcium as a structural builder — it supports bone density and mineral deposition, which is critical for strong bones as you age. It also plays a role in neuromuscular relaxation, helping your muscles relax and your nerves signal properly [NIH ODS]. This makes it a key mineral for daily function, but the exact amount in this product is not specified in the data provided.

Safety profile

FDA received a total of 592,059 adverse event reports across all supplements, though specific report counts for this product are not available. For calcium specifically, high levels 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 absorption of several medications, including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS]. Data not available for side effects specific to fermented black garlic.

Our recommendation

Start by checking your total daily calcium intake from food and other supplements. If you are taking medications like thyroid hormone or certain antibiotics, separate calcium by at least two hours [NIH ODS]. Data not available on the exact calcium dose in this product, so consult your healthcare provider before starting. Our recommendation: prioritize getting calcium from dietary sources first, and use supplements only if you have a confirmed deficiency.

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