BioStacks
Best for
Ingredients (9)
L-OptiZinc
100%Dose
30 mg
Target
15–30 mg
Form
Standard
Biotin
99%Dose
990 mcg
Target
1000–5000 mcg
Form
—
Vitamin A
100%Dose
750 mcg RAE
Target
700–1500 mcg
Form
Standard
Selenium
100%Dose
100 mcg
Target
100–200 mcg
Form
Standard
Vitamin D
40%Dose
400 IU
Target
1000–5000 IU
Form
Premium
Other Ingredients (2)
Microcrystalline CelluloseBinder
Plant-derived cellulose used as a binder and filler in supplements
Capsule ShellCapsule
Generic capsule shell where the label does not specify the material. Common materials are hypromellose (HPMC) for vegetarian capsules and gelatin for traditional capsules — both are GRAS-listed and safe. Fish gelatin and pullulan variants also exist.
How to Take It
Best taken in the evening
The Ashwagandha in it is what pulls this toward the evening. Take it with a meal containing fat — the vitamins A and D in it absorb poorly without one.
With a meal containing fat
Space it a couple of hours from Iron and Calcium
On the label
Men take 3 capsules daily with a meal, or as recommended by a healthcare professional. Not formulated for women or children.
General guidance based on the ingredients, not a substitute for the label or your doctor.
Price Check
$41.75
Pricier than 94% of 632 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.