BioStacks
Best for
Ingredients (17)
Bilberry
100%Dose
425 mg
Target
80–500 mg
Form
—
Vitamin B6
100%Dose
3 mg
Target
1.3–25 mg
Form
Premium
Vitamin C
100%Dose
500 mg
Target
250–2000 mg
Form
Standard
Vitamin B12
12%Dose
30 mcg
Target
250–5000 mcg
Form
Premium
Vitamin B1
12%Dose
3 mg
Target
25–100 mg
Form
Premium
Other Ingredients (4)
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.
Citric AcidAcidulant
Natural acid derived from citrus fruits
Malic AcidAcidulant
Naturally occurring organic acid found in apples, used as a flavor enhancer and acidulant in supplements
Stevia ExtractSweetener
Zero-calorie natural sweetener extracted from the leaves of Stevia rebaudiana
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 vitamin D in it absorbs poorly without one.
With a meal containing fat
On the label
Mix 1 packet of delicious and nutritious Efficient C Mixed Berry with 4 to 8 ounces of water. You can use more or less water to adjust flavor intensity.
General guidance based on the ingredients, not a substitute for the label or your doctor.
Price Check
$64.90
Pricier than 96% of 168 vitamin B7 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.