Vitamin A

Natural vs Synthetic Vitamin A: Forms, Absorption, Safety and Formulation Guide

By Warren Wan / 2026年7月21日

Quick Answer “Natural” vitamin A is not automatically safer, better absorbed or more effective than “synthetic” vitamin A. The more […]

Vitamins, Retinol, Vitamin A, Vitamin E

Vitamin E vs Retinol: Which One’s Your Skin’s Bestie?

By collagensei.com / 2025年2月24日

Hey, you! Ever found yourself staring at your skincare stash, wondering if Vitamin E or retinol deserves the top spot?

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Gensei began from a family owned facility producing animal derived material animal protein peptide in 2006. In 2010, our clients asked us if we could produce the hydrolyzed collagen peptide. From then, the germ has come out. With a burning desire, Collagensei merged into USA, Japan, Australia, New Zealand, Asia and South America markets.