Yes. Retinol degrades rapidly when exposed to light, air, and heat. Reputable USA manufacturers conduct accelerated stability testing — typically 40°C at 75% relative humidity for 3–6 months — to validate formula shelf life before production runs. Under MoCRA, safety substantiation is now a formal requirement. Always request a stability report from any manufacturer you consider.
Read the full guide on private label retinol toner manufacturer usa low moq →