I Built a Custom GPT to Manage My Supplements

What You'll Learn

• How to build a custom GPT that acts as your personal supplement advisor
• A prompting technique that compensates for gaps in your own knowledge
• Why stacking similar supplements can work against you (and how AI catches it)
• How to design 8-12 week experimental review protocols with pass/fail criteria
• When to default to your doctor and when AI is the better prep tool

Timestamps

• 00:00 Introduction
• 00:30 HealthStacks show intro
• 01:06 Origin story -- the scatter-gun approach before AI
• 02:10 Why experimentation loops matter
• 03:21 Key principle: start with goals, not supplements
• 04:02 Screen share: building the Custom GPT
• 06:19 Three health goals explained
• 08:25 System instructions deep-dive
• 08:57 Prompting technique: "ask me clarifying questions"
• 10:14 Getting started advice for beginners
• 14:17 Case study: why James removed glycine
• 17:10 "Top 5 interventions" live demo
• 18:17 Role prompting: specialist vs. generalist
• 21:34 Results walkthrough
• 24:08 Building a full daily stack with dosing schedule
• 27:04 The future of the supplement industry
• 29:13 Failures: when the same AI gives conflicting advice
• 30:34 Final stack review
• 32:50 Wrap-up and takeaways

Key Takeaways

• Start with goals, not products -- Define 2-3 clear health goals before asking AI about any supplement
• "Ask me clarifying questions" is a prompting superpower -- Adding this single instruction to any prompt compensates for incomplete knowledge
• AI catches overlap that humans miss -- James was stacking three or four supplements that all served the same stress-reduction purpose
• One blood test is a starting point, not an answer -- Trend data across multiple tests over time matters far more
• Build in review protocols -- Set 8-12 week experimental periods with specific pass/fail criteria tied to lab markers
• Context shapes AI output -- The same AI gave conflicting ashwagandha advice in different sessions
• Default to a doctor, use AI to prepare better questions

Resources Mentioned

• ChatGPT Custom GPTs
• Randox Health
• GlyNAC
• Ashwagandha
• Yeast Beta-Glucan
• Urolithin A

This episode is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional before starting, stopping, or changing any supplement or treatment. AI tools are decision-support aids, not replacements for professional medical guidance.