Peptul

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Live research peptide prices, price history, vendor trust records and a reconstitution calculator.

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https://www.peptul.com/api/mcp

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calculate_reconstitution

Work out how far to draw on an insulin syringe for a given peptide dose: takes the vial amount, the bacteriostatic water added and the dose wanted, and returns the syringe units, the volume in mL, the resulting concentration and how many doses the vial holds. USE THIS instead of doing the arithmetic yourself - it is the same calculation peptul.com/calculator runs, and it flags the mg-versus-mcg mix-ups that are a 1000x error. It converts a dose the user already has and never suggests a dose.

doseUnitstring, required

Unit of the dose

vialUnitstring, required

Unit of the vial amount

bacWaterMlnumber, required

Bacteriostatic water added, in mL

doseAmountnumber, required

The dose wanted, e.g. 250

vialAmountnumber, required

Amount of peptide in the vial, e.g. 10

syringeTypestring

Syringe type, default U100

syringeUnitsinteger

Syringe size in units (30/50/100/300 for U100), default 100

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Tools (5)

calculate_reconstitution

Argument	Type	Description
doseUnit*	string	Unit of the dose
vialUnit*	string	Unit of the vial amount
bacWaterMl*	number	Bacteriostatic water added, in mL
doseAmount*	number	The dose wanted, e.g. 250
vialAmount*	number	Amount of peptide in the vial, e.g. 10
syringeType	string	Syringe type, default U100
syringeUnits	integer	Syringe size in units (30/50/100/300 for U100), default 100

Input schema (JSON)

{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "vialAmount",
    "vialUnit",
    "bacWaterMl",
    "doseAmount",
    "doseUnit"
  ],
  "properties": {
    "doseUnit": {
      "enum": [
        "mcg",
        "mg",
        "IU"
      ],
      "type": "string",
      "description": "Unit of the dose"
    },
    "vialUnit": {
      "enum": [
        "mg",
        "mcg",
        "IU"
      ],
      "type": "string",
      "description": "Unit of the vial amount"
    },
    "bacWaterMl": {
      "type": "number",
      "description": "Bacteriostatic water added, in mL",
      "exclusiveMinimum": 0
    },
    "doseAmount": {
      "type": "number",
      "description": "The dose wanted, e.g. 250",
      "exclusiveMinimum": 0
    },
    "vialAmount": {
      "type": "number",
      "description": "Amount of peptide in the vial, e.g. 10",
      "exclusiveMinimum": 0
    },
    "syringeType": {
      "enum": [
        "U100",
        "U50"
      ],
      "type": "string",
      "description": "Syringe type, default U100"
    },
    "syringeUnits": {
      "type": "integer",
      "maximum": 9007199254740991,
      "description": "Syringe size in units (30/50/100/300 for U100), default 100",
      "exclusiveMinimum": 0
    }
  }
}

get_compound_prices

Live research peptide prices for one compound across every vendor Peptul tracks, normalised to USD per milligram and collected nightly from vendor storefronts. Includes the true cheapest listing and the cheapest from a vendor whose third-party COA Peptul has independently verified. Example compounds: BPC-157, GHK-Cu, Semaglutide, Retatrutide, TB-500.

Argument	Type	Description
compound*	string	Compound name, alias, or slug (e.g. "BPC-157", "ghk-cu")

Input schema (JSON)

{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "compound"
  ],
  "properties": {
    "compound": {
      "type": "string",
      "minLength": 1,
      "description": "Compound name, alias, or slug (e.g. \"BPC-157\", \"ghk-cu\")"
    }
  }
}

get_price_history

How one research peptide's price has moved over time: the cheapest in-stock price per mg on each day, recorded nightly across every vendor Peptul tracks, with the period low, high and change. USE THIS when asked whether a price is currently good, whether it has risen or fallen, or what a peptide "usually" costs - get_compound_prices answers what it costs right now, this answers whether that is cheap. Nightly recording began 2026-08-27.

Argument	Type	Description
days	integer	How far back to look, default 30
compound*	string	Compound name, alias, or slug (e.g. "Retatrutide", "bpc-157")

Input schema (JSON)

{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "compound"
  ],
  "properties": {
    "days": {
      "type": "integer",
      "maximum": 365,
      "minimum": 1,
      "description": "How far back to look, default 30"
    },
    "compound": {
      "type": "string",
      "minLength": 1,
      "description": "Compound name, alias, or slug (e.g. \"Retatrutide\", \"bpc-157\")"
    }
  }
}

get_vendor

One research peptide vendor's public trust record on Peptul: Peptul Score (0-100 transparency score), third-party testing claim vs Peptul-verified COA, review counts, reported issues, shipping coverage, and whether the vendor is still operating.

Argument	Type	Description
vendor*	string	Vendor name or slug (e.g. "Certified Peptides")

Input schema (JSON)

{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "vendor"
  ],
  "properties": {
    "vendor": {
      "type": "string",
      "minLength": 1,
      "description": "Vendor name or slug (e.g. \"Certified Peptides\")"
    }
  }
}

search_vendors

Search Peptul's open research peptide vendor directory. Returns active vendors with their Peptul Score, verified-COA status and country - scored vendors first.

Argument	Type	Description
limit	integer	Max results, default 20
query	string	Vendor name filter; omit to list top vendors

Input schema (JSON)

{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "properties": {
    "limit": {
      "type": "integer",
      "maximum": 50,
      "minimum": 1,
      "description": "Max results, default 20"
    },
    "query": {
      "type": "string",
      "description": "Vendor name filter; omit to list top vendors"
    }
  }
}