BioStacks
Isotonix

Multivitamin with Iron

Powder · 3.3 Grams · 90 servings · $0.40/serving

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Best for

ImmuneGeneral HealthDental

Ingredients (23)

Iodine

100%

Dose

150 mcg

Target

150–500 mcg

Form

Premium

Vitamin D3

100%

Dose

1000 IU

Target

1000–5000 IU

Form

Premium

Niacin

100%

Dose

40 mg ne

Target

25–500 mg

Form

Standard

Vitamin B12

30%

Dose

75 mcg

Target

250–5000 mcg

Form

Premium

Pantothenic Acid

40%

Dose

20 mg

Target

50–500 mg

Form

Premium

Other Ingredients (12)

FructoseSweetener

Added free fructose is metabolized in the liver and at habitual intake is linked to elevated triglycerides, hepatic fat accumulation, and insulin resistance; an avoidable sugar load with no supplement benefit.

MaltodextrinBinder

Spikes blood sugar faster than table sugar (glycemic index 85–105). Research links it to gut bacteria changes that may promote intestinal inflammation (Nickerson et al. 2015). Used as a cheap filler — adds nothing beneficial.

Natural FlavorsFlavor

Broad regulatory category of flavor constituents derived from natural sources. Composition is proprietary and not disclosed — 'Natural Flavors' can include several hundred different compounds depending on the target flavor profile, including hexane-extracted constituents and proprietary carrier solvents. 'Natural' is a regulatory definition (21 CFR §101.22), not a safety guarantee.

Fruit Juice (unspecified)Colorant

Juice or juice concentrate used primarily for natural color and flavor in gummies

Silicon DioxideAnti-caking

Fine silica powder used to prevent clumping

Natural Vanilla PowderFlavor

A dried natural vanilla flavoring powder

Citric AcidAcidulant

Natural acid derived from citrus fruits

Monk Fruit ExtractSweetener

Zero-calorie natural sweetener derived from the monk fruit (Siraitia grosvenorii)

How to Take It

Take it anytime

No evidence a formula this broad works better at any particular hour. Take it with a meal containing fat — the vitamins A, D and E in it absorb poorly without one.

With a meal containing fat
Keep it away from coffee, tea and dairy
Space it a couple of hours from Calcium, Magnesium and Green Tea Leaf Extract

On the label

Pour 1 level, white bottle capful of powder into the overcap. Add water to the line on the overcap (2 fl. oz./60 mL) and stir. As a dietary supplement, take once daily or as directed by your healthcare provider. Maximum absorption occurs when taken on an empty stomach. This product is isotonic only if the specified amounts of powder and water are used.

General guidance based on the ingredients, not a substitute for the label or your doctor.

Price Check

$35.95

$10$20$50

Near the median of 797 multivitamins

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Sources & Scoring

Nutrient data (RDA, UL, and safety thresholds) sourced from: NIH Office of Dietary Supplements and National Academies Dietary Reference Intakes (DRI).

This is not medical advice. Consult a healthcare provider before making changes to your supplement routine.

The score analyzes what's on the label: ingredient doses vs. clinical ranges, chemical forms, evidence levels, and known interactions. It does not verify label accuracy or test for contaminants — for that, look for third-party certifications like USP or NSF.

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