Browse everything for free. Go Premium for personalization. Practitioner Pro for research professionals.
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Not satisfied after your trial? We'll refund your first payment in full, no questions asked.
For one-off questions, sure. But a language model does not remember your stack across sessions, cannot write to your calendar, does not track what you took or how you felt, and does not alert you when new research changes your protocol. ProtocolEngine is the persistent system around the questions, not the answer bot itself. See the full comparison.
Browse all protocols, supplements, and habits with evidence grades. Take the personalization quiz for a tailored protocol. Use the interaction checker and order supplements via iHerb. Preset AI questions on every detail page. Create a free account to save protocols, build your supplement stack, get weekly evidence digest emails, and bookmark research.
Sync your protocol to Google Calendar or export as .ics. 30 Evidence Assistant questions per day with custom questions. Evidence alerts when new research affects your stack. Progress journal to track how you feel and see what works. Smart stack intelligence with synergy, gap, and conflict alerts. Diet optimization with personalized meal plans and recipes.
Practitioner Pro is built for health professionals, researchers, and coaches. It includes the full database explorer with advanced filters, CSV export, unlimited Evidence Assistant questions, cross-referencing across claims, papers, supplements, and diseases, and evidence factor breakdowns for every supplement.
We use a 7-factor confidence algorithm aligned with the GRADE framework and Cochrane Handbook. Factors: study design (21%), risk of bias (16%), replication (21%), sample size (16%), consistency (11%), precision (5%), and recency (10%). Effect size is reported separately as its own axis. Scores update automatically when new research publishes.
Premium includes a 14-day free trial. Practitioner Pro includes a 7-day free trial. You will not be charged until the trial ends. Cancel anytime during your trial and you will not be billed.
Yes. Cancel your subscription at any time from your dashboard. You keep access until the end of your billing period. No cancellation fees.
No. ProtocolEngine provides educational health information based on published research. Evidence grades reflect research quality, not guaranteed outcomes. Always consult a healthcare professional before starting any supplement or protocol.
Our automated pipeline ingests from PubMed, bioRxiv, and medRxiv daily. We currently index over 32,000 papers and prioritize meta-analyses, systematic reviews, and randomized controlled trials. Claims are extracted and linked to supplements and habits automatically.