Vitamin C Serum - How long does it take to see results January 01, 2019 18:34 Initial results will be seen in 4-6 weeks, with full results in 3 months. Related articles Vitamin C Serum - What happens if I miss an application or don't use it regularly? Vitamin C Serum - How to apply Perfect Lashes - What happens if I miss an application or don't use it regularly? Lip Plumper - Is it flavored? Breast Shaping - Can I use while breastfeeding? Comments 0 comments Please sign in to leave a comment.