Most common questions used to investigate
Do you want to use it to prevent the damage from free radicals?
Do you have sensitive skin?
Are you using a gentler product with a lower concentration of vitamin C?
Are you using a moisturizer?
Common conclusions
You should start applying a vitamin C serum in the morning in order to prevent damage from free radicals that can occur throughout the day. If you do choose to use your serum in the morning, you should follow up with a layer of broad spectrum sunscreen, with an SPF of 30 or higher.
Vitamin C is generally pretty safe and well tolerated, but if you have sensitive skin, so you should definitely try La Roche-Posay HyaluB5 Hyaluronic Acid Serum, Eau Thermale Avène Hydrance Intense Serum, Caudalie Vinosource S.O.S Thirst Quenching Serum etc. You need to know that a higher concentrations of vitamin C could make sensitive skin more prone to irritation and sunburn, so if your skin tends to be reactive to products that contain retinol and similar ingredients, you should use your vitamin C serum as a PM-only product.
If you are using a gentler product with a lower concentration of vitamin C, you might see extra benefits from applying it twice per day, both AM and PM.
You should definitely start using a moisturizer (moisturizer is a must if you use Vitamin C Serum), because you need to use Vitamin C Serum after cleansing, exfoliating, masking or toning
References
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