Customers question bottle fill level, unaware of necessary airspace for safe vitamin C oxidation prevention per manufacturer guidelines.
Reviewers initially complain about bottle capacity until learning the vacant space intentionally prevents oxidation and gas-related risks through proper shaking technique.
This review is from Amazon.com for product:
COSRX Pure Vitamin C 13% Serum with Vitamin E & Hyaluronic Acid, Hydrating Facial Serum for Fine Lines, Uneven Skin Tone & Dull Skin, 0.67fl.oz/20ml, Korean Skin Care
Everyone keeps complaining about the amount in the bottle. If you read the manufacturer website about storing and handling it specifically says extra room added to the bottle for safe use. Gas can be generated therefore the room in the bottle has a purpose. Gently shake bottle.
Vitamin Basics & Tips
Vitamin C (ascorbic acid) formulations require special handling due to their chemical instability. The empty space in serum bottles serves multiple purposes: it accommodates gas release from decomposition reactions, minimizes oxygen exposure to slow oxidation, and allows proper mixing when shaken. L-ascorbic acid solutions gradually degrade when exposed to light, heat, and air – a process accelerated in completely full containers due to pressure changes.
Proper storage in cool, dark environments helps maintain potency. Some manufacturers use amber bottles and airless pumps to extend shelf life. When vitamin C oxidizes (turning dark yellow or brown), it becomes less effective but not harmful. Users should shake bottles gently to redistribute settled particles without introducing excessive oxygen through vigorous motion.
Daily vitamin C serum application helps combat free radicals, boosts collagen production, and brightens skin tone. Pairing it with vitamin E and ferulic acid enhances stability and efficacy. For optimal results, apply to clean dry skin before moisturizers and always follow product-specific storage instructions to preserve antioxidant properties.
Great product, frustrating pump mechanism requiring YouTube troubleshooting for proper use.
Effective serum hampered by defective pump design; customers recommend watching YouTube tutorials for troubleshooting steps to activate dispenser.
Esthetician-approved vitamin C serum hydrates overnight, doubles as a blurring makeup primer without drying skin.
This vitamin C serum boosts hydration overnight, acts as a grippy makeup primer, and delivers radiant skin without dryness, per a skincare pro.
Non-acidic vitamin C with large capsules; ideal for sensitive stomachs but challenging for elderly users.
Effective non-acidic vitamin C formula, though large capsule size could challenge elderly users' swallowing comfort.
Easy-swallow vitamin C keeps child healthy all winter, proven cold/flu season protection.
Children's vitamin C tablets prevent seasonal sickness, easy to swallow, effective for winter immunity according to parent review.
Repeat buyer credits vitamin C for staying illness-free despite daily germ exposure as an educator.
Educator repeatedly relies on this vitamin C supplement to avoid sickness despite constant germ exposure at work.
High-quality vitamin C boosts energy, immunity effectively with pleasant taste.
Effective Garden of Life vitamin C supports energy, immunity, and tastes great.
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