truthstack-langchain

LangChain + OpenAI function calling integration for TruthStack supplement safety API.

Check supplement-drug interactions, get evidence balance with citations, search compounds, and access FDA adverse event signals — all through LangChain tools or OpenAI function calling.

Install

npm install truthstack-langchain

Quick Start

LangChain.js

const { getTruthStackTools } = require('truthstack-langchain');

const tools = getTruthStackTools({ apiKey: 'your-api-key' });
// tools is an array of 5 LangChain-compatible tools:
//   truthstack_check_interactions
//   truthstack_get_evidence
//   truthstack_search_supplements
//   truthstack_safety_signals
//   truthstack_drug_profile

// Use with any LangChain agent:
const { AgentExecutor } = require('langchain/agents');
const agent = new AgentExecutor({ tools, llm, ... });

const result = await agent.invoke({
  input: "Can I take berberine while on Ozempic?"
});

OpenAI Function Calling

const { getOpenAIFunctions, handleOpenAIFunctionCall } = require('truthstack-langchain');
const OpenAI = require('openai');

const openai = new OpenAI();
const functions = getOpenAIFunctions();

const response = await openai.chat.completions.create({
  model: 'gpt-4',
  messages: [{ role: 'user', content: 'Is magnesium safe with sertraline?' }],
  functions,
  function_call: 'auto',
});

// Handle the function call
const call = response.choices[0].message.function_call;
const result = await handleOpenAIFunctionCall(
  call.name,
  JSON.parse(call.arguments),
  { apiKey: 'your-api-key' }
);

Direct Client

const { TruthStackClient } = require('truthstack-langchain');

const client = new TruthStackClient({ apiKey: 'your-api-key' });

// Check interactions
const safety = await client.checkInteractions(
  ['berberine', 'magnesium', 'vitamin_d'],
  ['semaglutide']  // medications
);
console.log(safety.risk_level);  // "HIGH"
console.log(safety.cyp_pathway_conflicts);
console.log(safety.evidence_by_compound);

// Get evidence
const evidence = await client.getEvidence('berberine');
console.log(evidence.evidence_balance);  // { positive: 8, null: 2, negative: 1, ... }
console.log(evidence.citations);  // [{ pmid: "12345", claim_summary: "...", ... }]

// Search
const results = await client.searchCompounds('mag glycinate');
console.log(results.results[0].compound_id);  // "magnesium"

System Prompts

Pre-built system prompts for common use cases:

const { SYSTEM_PROMPTS } = require('truthstack-langchain');

// Available prompts:
SYSTEM_PROMPTS.supplement_safety_advisor    // General supplement safety
SYSTEM_PROMPTS.glp1_supplement_checker      // GLP-1/Ozempic focus
SYSTEM_PROMPTS.evidence_researcher          // Research evidence analysis
SYSTEM_PROMPTS.stack_optimizer              // Stack optimization
SYSTEM_PROMPTS.clinician_assistant          // Clinician-facing

Tools

| Tool | Description | |------|-------------| | truthstack_check_interactions | Check supplement-supplement and supplement-drug interactions | | truthstack_get_evidence | Get evidence balance + citations for a compound | | truthstack_search_supplements | Fuzzy search for supplements | | truthstack_safety_signals | FDA adverse event (CAERS/FAERS) data | | truthstack_drug_profile | Drug CYP450 pathways + botanical interactions |

Environment Variables

TRUTHSTACK_API_KEY=your-key     # Required
TRUTHSTACK_BASE_URL=https://api.truthstack.co  # Optional

API Key

Get a free API key (2,000 calls/month) at truthstack.co/developers.

Data

TruthStack's vault contains:

• 300+ research findings from PubMed across 50+ supplements
• FDA CAERS + FAERS adverse event signals
• CYP450 pathway interactions
• Drug-botanical interactions from FDA labeling
• Evidence updated daily via automated research pipeline

License

MIT

Links

• API Documentation
• MCP Server
• Website