BioStacks
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Ingredients (6)
Vitamin D3
100%Dose
2520 IU
Target
1000–5000 IU
Form
Premium
Zinc
100%Dose
20 mg
Target
15–30 mg
Form
Premium
N-Acetyl-L-Cysteine
100%Dose
600 mg
Target
600–1800 mg
Form
—
Vitamin A
100%Dose
1500 mcg RAE
Target
700–1500 mcg
Form
Standard
Vitamin C
100%Dose
300 mg
Target
50–250 mg
Form
Budget
Other Ingredients (3)
Silicon DioxideAnti-caking
Fine silica powder used to prevent clumping
HypromelloseCapsule
Plant-derived capsule material from cellulose
Ascorbyl PalmitateAntioxidant
Fat-soluble form of vitamin C used as preservative
How to Take It
Take it anytime
Fat-soluble — take with your largest fat-containing meal. Time of day doesn't matter.
With a meal containing fat
NAC does better on an empty stomach, but something else in this bottle needs food. Taking the whole product with a meal is the better trade — an upset stomach is why most people stop.
Space it a couple of hours from Iron and Calcium
On the label
Take two capsules daily, or use as directed by your healthcare professional.
General guidance based on the ingredients, not a substitute for the label or your doctor.
Price Check
$47.00
Pricier than 95% of 586 vitamin D supplements
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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.