diff --git a/backend/innercontext/api/products.py b/backend/innercontext/api/products.py
index 9630ae2..f4834c6 100644
--- a/backend/innercontext/api/products.py
+++ b/backend/innercontext/api/products.py
@@ -227,7 +227,7 @@ Given raw text (product page copy, ingredient list, label scan, etc.), \
 extract structured product data and return it as a single JSON object.
 
 RULES:
-- Return ONLY raw JSON — no markdown code fences, no explanation, no preamble.
+- Return ONLY raw JSON — no markdown code fences, no explanation, no preamble, no indentation or extra whitespace (minified).
 - Omit any field you cannot confidently determine from the text. Do not guess.
 - All enum values must exactly match the allowed strings listed below.
 - For INCI lists: return each ingredient as a separate string in the array, \