Solaray B-Stress Plus Iron and Zinc

Our assessment

The evidence shows that this supplement is formulated to support energy metabolism and immune function. The key ingredients — B vitamins, iron, and zinc — are well-documented for their roles in red blood cell formation and nerve health. However, the specific combination in this product has limited clinical trial data, so our assessment is based on the individual nutrients provided in your data [NIH ODS].

How it works

Think of this supplement as a metabolic support system. The calcium component aids in bone mineralization and neuromuscular relaxation [NIH ODS]. The iron and zinc work with B vitamins to help your body convert food into usable energy and maintain a healthy immune response. This combination is particularly helpful if you have a known deficiency in these minerals [NIH ODS].

Safety profile

Data not available for this specific product's adverse events. However, for the calcium component, high intakes may increase the risk of heart disease and prostate cancer, and high blood levels can cause poor muscle tone, constipation, nausea, weight loss, and abnormal heart rhythms [NIH ODS]. The FDA has received 592,059 total adverse event reports across all supplements, but no specific count is provided for this product [FDA data]. Calcium can also reduce absorption of medications like tetracycline antibiotics, levothyroxine, and phenytoin [NIH ODS].

Our recommendation

We recommend taking this supplement only if you have a confirmed need for iron and zinc alongside B vitamins. Start with one serving daily, and take it with food to minimize stomach upset. Because calcium can interfere with certain medications, separate your supplement from those drugs by at least two hours [NIH ODS]. If you experience nausea, constipation, or unusual tiredness, stop use and consult your healthcare provider [FDA data].

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