Our Quality Standards
The supplement industry is full of buzzwords and fine print. This page is where we show our work — exactly what goes into your stack, why it's in there, and how we know it works.
Quality Seal
Stack Verified
How we make it
Every formula in Stack meets three standards most brands don't even disclose.
Every batch of every ingredient is verified by independent labs before it reaches your stack — identity, potency, heavy metals, microbial contamination. If it fails, the lot doesn't ship. This is the floor under 21 CFR Part 111, not a bonus.
No fairy-dust amounts. Every dose is calibrated to what peer-reviewed research actually shows is effective — not the bare-minimum amount that lets a competitor put the ingredient on their label.
Most supplement research is done on men. Our formulas account for the differences — hormonal cycles, iron needs, lower body mass, life stages — so the dose that reaches your body is the right one for your body.
Certifications & standards
Manufactured under cGMPs. Every Stack product is made in facilities compliant with the FDA's Current Good Manufacturing Practices — the federal regulatory floor for dietary supplements.
Independently tested. Each ingredient lot is tested by independent labs for identity, potency, heavy metals, and microbial contamination before the capsule ever enters a pack — in line with 21 CFR Part 111 requirements and our manufacturer's cGMP protocols.
No proprietary blends. Every ingredient has its exact milligram dose printed on the label. If a brand won't tell you how much of an ingredient you're getting, there's a reason.
Clean label, full stop. No artificial colors, no titanium dioxide, no unnecessary fillers. Allergens (dairy, gluten, soy, nuts) are clearly disclosed on every product page.
The Stack
Standard
est. 2026
How Stack is different
Your stack is generated from your quiz answers: life stage, cycle patterns, diet, medications, goals. Nothing in the pack is there because a trend said so — it's there because the evidence says it matters for someone with your specific profile.
Needs shift through cycles, postpartum, perimenopause, and beyond. Stack's formulation engine is the only one we know of that actively weights recommendations on life stage and cycle symptoms — so a perimenopausal body gets a different stack than a TTC one, even with the same goal.
When a bottle says '500 mg magnesium,' that's what's in the capsule — measured, verified, and accurate to the label. We don't overstate, understate, or use proprietary blend tricks to hide the real amounts.
Where each ingredient comes from, what form (methylfolate vs. folic acid, magnesium glycinate vs. oxide), and why we chose it — all printed on the product page. No mystery ingredients, no marketing-friendly forms masking cheap ones.
See it in your stack
Take the 2-minute assessment and see the stack our AI builds for your body — and every standard it was held to along the way.
Take the quiz