HP TRIPLE RETINOL RENEWAL SERUM. Benefits: Formulated with a proprietary triple retinol blend, this powerful day & night serum accelerates skin renewal with less sensitivity to deliver the look of collagen-rich, firmer skin. Works together with antioxidant powerhouse coenzyme Q10, & naturally derived beta-carotene (vitamin A) to visibly diminish uneven texture & dullness for a more even, radiant complexion. Key Ingredients: Triple Retinol Blend: Advanced Skin Recovery. Coenzyme Q10 (CoQ10): Antioxidant Skin Renewal. Beta-Carotene Anti-Photoaging Support:. Research Results: 93% agreed it does not cause any visible signs of irritation, such as redness, scaling, swelling. 91% agreed it does not cause any skin discomfort, such as stinging, burning, itching, tightness. 86% agreed skin texture looks and feels smoother. 78% showed significant improvement in the feel of rough skin texture**. **In a clinical study of 37 women after 8 weeks.. In a consumer study of 102 women after 28 days..