NOW Foods Cal-Mag Stress Formula 100 Tablets

What it is

NOW Foods Cal-Mag Stress Formula is a dietary supplement supplied as 100 tablets in a white bottle with a purple cap. The front panel reads "Cal-Mag Stress Formula*", "With B-Complex and Vitamin C", "100 Tablets", "A Dietary Supplement" and "Vegetarian/Vegan". A serving is two tablets and the panel declares 50 servings, so one bottle covers 50 days at the suggested usage. It sits in our Minerals aisle, within the wider Supplements range.

A teal band across the top names the shelf category, "Minerals", and the panel carries the line "Family owned since 1968." The maker is printed as NOW FOODS of Bloomingdale, Illinois, under the statement "Made and quality tested in the USA with globally sourced ingredients."

What's inside

The panel declares fifteen nutrients, and two of the compounds on it are counted in three different rows. Vitamin C is listed as coming from ascorbic acid and from magnesium ascorbate and calcium ascorbate; those two ascorbates then reappear among the sources of elemental calcium and elemental magnesium. One salt, declared three times, because a mineral ascorbate is genuinely made of both halves — the mineral and the ascorbate ion.

Each mineral is drawn from three compounds rather than one: calcium from calcium carbonate, calcium citrate and calcium ascorbate; magnesium from magnesium oxide, magnesium citrate and magnesium ascorbate. Six source compounds, two declared nutrients. The panel prints "elemental" beside both, which is the figure that matters on a mineral label: calcium carbonate is only about 40 percent calcium by weight, so the elemental number is the mineral itself rather than the salt. Here that is 1 g (1,000 mg) of calcium at 77% of the Daily Value and 500 mg of magnesium at 119%. The NIH Office of Dietary Supplements publishes plain-language background on calcium and on magnesium.

The B-complex here is a full one: thiamin (B-1), riboflavin (B-2), niacin (B-3) as niacinamide, B-6, folate, B-12 as cyanocobalamin, biotin, and pantothenic acid (B-5). The folate row is printed in two units — 1,360 mcg DFE, with "(800 mcg folic acid)" underneath. DFE stands for Dietary Folate Equivalents, a conversion the FDA requires on labels because synthetic folic acid is absorbed more readily than the folate found in food. The multiplier is 1.7, and the arithmetic here is exact: 800 × 1.7 = 1,360. The NIH folate fact sheet sets out both units, and there is a companion sheet on vitamin C.

Three nutrients round out the list. Choline appears at 20 mg and 4% of the Daily Value. Inositol (20 mg) and PABA, or para-aminobenzoic acid (10 mg), are the last two rows, and both carry a dagger instead of a percentage. The panel spells out what it means: "Daily Value not established." That is a regulatory fact rather than a quality judgment — no reference intake has been set for those two, so there is no denominator to divide by.

The other-ingredients line covers the parts of the tablet that are not nutrients, and two of them pull in opposite directions by design — hydroxypropyl cellulose binds the blend so it holds shape under compression, while croscarmellose sodium swells on contact with fluid so the tablet breaks apart again. Both stearates are noted as vegetable source.

Supplement Facts

† Daily Value not established. Transcribed from the Supplement Facts panel on the bottle.

How to use it

The printed suggested usage is: "Take 2 tablets daily with food. Can be taken in divided doses." Both halves are the manufacturer's own wording, so splitting the serving between two meals sits squarely within the label, and taking it with food is part of the instruction. Storage is printed on the same panel: "Store in a cool, dry place after opening."

The tablet is a caplet rather than a round pill. NOW's size card shows an oblong, centrally scored tablet against inch and centimeter rulers, measuring close to seven-eighths of an inch, or roughly 22 mm, end to end. The card notes that size and color shown may vary from the actual product, and the panel adds "Natural color variation may occur in this product," so read both as indicative.

Who it's for

This is a general adult mineral-and-vitamin tablet, and the label restricts it plainly: "For adults only." It is one of several NOW calcium-and-magnesium formats we carry, and what sets this one apart is the length of its panel: fifteen rows, because vitamin C, a full B-complex, choline, inositol and PABA sit alongside the two minerals. If you already take a multivitamin, that overlap is worth a look first, and anyone wanting the two minerals without the extra rows has simpler options in the same Minerals category.

The front panel is marked "Vegetarian/Vegan", and the other-ingredients line backs that up by naming both stearates as vegetable source. A triangle-K symbol is printed on the front panel and a plain K on the edge of the Supplement Facts panel.

Good to know

Everything in this section is quoted or read directly from the bottle.

• Printed caution. "For adults only. Consult physician if pregnant/nursing, taking medication, or have a medical condition. Keep out of reach of children."
• Biotin and bloodwork. "This product contains Biotin which may interfere with some blood test results. Go to nowfoods.com/biotinlab for details."
• Allergens. "Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish, tree nut or sesame ingredients. Produced in a GMP facility that processes other ingredients containing these allergens." The second half matters if you react to trace amounts: the facility is shared even though the formula is not.
• Manufacturing mark. The bottle's side panel carries a "GMP Quality Assured" roundel. The Intertek GMP Certification globe mark appears on a separate NOW information card in this listing's gallery, not on the bottle itself.
• Reading the asterisk. "Stress Formula*" on the front and the paragraph on the side panel both carry an asterisk pointing to the manufacturer's own FDA statement. The FDA sets out what that mark signifies in its guidance on structure/function claims.
• Discreet delivery. Orders ship in plain outer packaging. It will not show the Gear Isle name.

Frequently Asked Questions

How many tablets are in the bottle, and how long does that cover?

The bottle holds 100 tablets. At the printed serving of two tablets daily the panel declares 50 servings, which works out to a 50-day supply — 100 divided by 2.

Why does the vitamin C row mention calcium and magnesium?

Because two of the vitamin C sources in this formula are mineral salts of it. Magnesium ascorbate and calcium ascorbate are named in the vitamin C row and again among the mineral sources, since each contributes both halves.

Are the tablets suitable for a vegetarian or vegan diet?

The front panel is printed "Vegetarian/Vegan". The other-ingredients line supports that by specifying "stearic acid (vegetable source)", "magnesium stearate (vegetable source)" and a vegetarian coating. No gelatin or other animal-derived ingredient is listed on the panel.

Does this contain enough biotin to matter before a blood test?

The panel declares 300 mcg of biotin per two-tablet serving, and the manufacturer prints a notice about blood tests directly on the bottle, referring readers to nowfoods.com/biotinlab. Mention it to whoever is taking the sample if you have bloodwork scheduled.

Product information compiled and reviewed by the Gear Isle product team. We transcribe supplement facts directly from manufacturer packaging. Found an error? Tell us.

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Dietary supplement for adults 18 and over. Consult a licensed healthcare professional before use, especially if you have a medical condition, heart concerns, or take prescription medication (including nitrates). Keep out of reach of children.