WA SB5622

Prohibits the sale, offer, or giveaway of over-the-counter diet pills and dietary supplements for weight loss or muscle building to individuals under 18 years of age in Washington State

Requires retail establishments to verify proof of age using valid government-issued photo identification (driver's license, passport, military ID, tribal enrollment card, or merchant marine card), though ID is not required for purchasers who reasonably appear to be at least 25 years old

Mandates that online and delivery sellers use shipping methods requiring signature by an adult 18 or older with valid photo ID upon delivery

Excludes protein powders, protein drinks, and foods marketed as containing protein from the restrictions, unless they contain additional weight loss or muscle building ingredients

Authorizes the Attorney General to investigate and enforce violations, with penalties up to $500 per violation (or up to $1,000 for violations involving improper resale or dissemination of transaction scan data)