What Are Pain Relief Patches Made Of? Ingredients & Structure Explained

Three-Layer Structure of Pain Relief Patches

Pain relief patches consist of three functional layers working together:

• Backing film (outer layer) — Waterproof PET or non-woven fabric that protects the adhesive and keeps moisture in. Typical thickness: 25-50 microns.
• Active ingredient layer (middle) — Contains the therapeutic agents: menthol (5-15%), camphor (2-5%), methyl salicylate, or herbal extracts like ginger root and turmeric curcumin. This layer releases ingredients through the skin over 6-12 hours.
• Medical-grade adhesive (inner layer) — Acrylic-based adhesive safe for prolonged skin contact. Maintains bond for up to 12 hours without causing irritation in most users.

How Transdermal Delivery Works

The active ingredients penetrate the stratum corneum (outermost skin layer) and reach nerve endings beneath. Menthol activates TRPM8 cold receptors, creating a cooling sensation that masks pain signals. Camphor stimulates warm receptors, increasing local blood flow by approximately 30% according to clinical studies.

Common Active Ingredients and Their Functions

Frequently Asked Questions

Q: How long does one pain relief patch last?
A: Most standard patches provide 6-12 hours of continuous relief. Extended-release formulations can work up to 24 hours. Remove before sleeping to avoid skin irritation.

Q: Can pain relief patches be used on children?
A: Children under 2 should not use menthol-based patches. For ages 2-12, use pediatric formulations with reduced menthol concentration (under 5%). Always consult a pediatrician first.

Q: What is the difference between OEM and ODM patch manufacturing?
A: OEM means you provide the formula and branding — we manufacture it. ODM means we design the formula and packaging from scratch for your brand. Henan Hanmeng Bio-Tech offers both services with MOQ starting at 10,000 pieces.

Henan Hanmeng Bio-Tech manufactures medical-grade health patches for global brands. Contact us for OEM/ODM partnerships and custom formulation development.