Marketing
Growth loops
A funnel converts a cohort once. A loop turns each output back into the input, so growth compounds. Build for loops first.
Highest leverage · slowest start
Word-of-Mouth Loop
Patients who hit M3 with strong outcomes refer a friend → friend converts at 2–3× the cold rate → friend's outcomes feed back into NPS & UGC pool.
Multiplier · K-factor target ≥ 0.4 by M9
Compounds for years
Content / SEO Loop
Long-form clinical content earns search rank → ranked content captures high-intent traffic → conversions fund more content → deeper topic authority earns more rank.
Multiplier · 8–14× ROI by month 18 vs paid-only
Fastest signal · weakest moat
Paid Acquisition Loop
Paid drives patients → patient data improves model targeting → server-side conversion signal sharpens lookalikes → blended CAC drops → reinvest savings into channel expansion.
Multiplier · Bid on retention, not conversion. CAC drops 20–40% over 90 days.