The form matters more than the dose.
Most supplement brands compete on milligrams. ROOK competes on absorption. Every formula starts with the most bioavailable, clinically-studied form of each ingredient — then doses it at levels supported by published research.
Bioavailability First
We select ingredient forms based on published absorption data, not cost.
Branded & Patented
Every key ingredient is traceable to a specific manufacturer with clinical validation.
Third-Party Verified
Every batch tested by ISO 17025-accredited labs for identity, potency, and purity.
Transparent Formulas
No proprietary blends. Every ingredient and its exact amount is on the label.
Milligrams on a label do not equal milligrams in your blood.
The supplement industry has trained consumers to evaluate products by a single metric: the dose on the Supplement Facts panel. More milligrams means more effective, right? This assumption is fundamentally wrong.
Magnesium oxide contains 60% elemental magnesium by weight — an impressive label number. But only 4% of that magnesium is actually absorbed. A 500mg magnesium oxide tablet delivers roughly 12mg of usable magnesium. Meanwhile, magnesium bisglycinate chelate, with a lower elemental percentage, delivers dramatically more usable mineral per serving.
The same pattern repeats across nearly every supplement category: the cheapest ingredient form looks impressive on the label but delivers a fraction of its stated dose to your body.
Start with the bioavailable form. Dose it at clinically-studied levels.
Every ROOK formula begins with a single question: what is the most bioavailable, clinically-validated form of this nutrient? We then source that specific form — typically a patented, branded ingredient with published absorption data — and dose it at the levels used in clinical research.
This means our products may not have the highest milligram counts on the shelf. But they deliver more usable nutrient per serving than products with twice the label dose in inferior forms.
We do not use proprietary blends. Every ingredient, its form, and its dose are disclosed on the label. The science is not a marketing story — it is the product.
Patented forms. Published data.
We exclusively use branded, patented ingredient forms with peer-reviewed research supporting their absorption, efficacy, and safety profiles.
Ferrochel®
The most clinically studied chelated iron on the market. Ferrochel wraps elemental iron in two glycine molecules, creating a stable chelate that absorbs through amino acid pathways — not competing mineral ion channels. This eliminates the GI distress of ferrous sulfate while delivering equivalent or superior iron status improvements.
Used in: Iron Bisglycinate + CTRAACS®
The Real Amino Acid Chelate System — the gold standard in mineral chelation technology. Every TRAACS magnesium bisglycinate molecule is verified as a true chelate through rigorous analytical testing, ensuring consistent absorption without the laxative effects of oxide or citrate forms.
Used in: Magnesium BisglycinateUSP-Grade Glycine
Our glycine is sourced as a free-form amino acid — not bound to other compounds, not extracted from protein hydrolysates. Free-form amino acids require no digestion and are absorbed directly through amino acid transporters in the small intestine for rapid bioavailability. The 3g dose matches the clinical research on sleep quality.
Used in: GlycineBeyond the minimum.
cGMP compliance is the legal minimum for supplement manufacturing — not a differentiator. ROOK goes further at every stage.
Raw Material Testing
Every incoming ingredient tested for identity, potency, and purity.
Heavy Metal Analysis
Batch testing for lead, arsenic, mercury, and cadmium below California Prop 65 thresholds.
Microbial Analysis
Batch testing for total aerobic count, yeast, mold, E. coli, Salmonella.
Potency Verification
Every batch verified to contain labeled amounts within USP tolerances.
Form vs. form.
| Nutrient | Common Form | ROOK Form | Advantage |
|---|---|---|---|
Iron | Ferrous Sulfate | Ferrochel® Bisglycinate | Equivalent efficacy, dramatically fewer GI side effects |
Magnesium | Magnesium Oxide (~4% abs.) | TRAACS® Bisglycinate (~40%+ abs.) | 10x higher absorption, no laxative effect |
Sleep Support | Melatonin (hormone) | Glycine (amino acid) | Non-hormonal, non-sedative, no dependency |