You can rebuild collagen in your face by using face creams and face serums with vitamin A and it's derivatives including retinol.
Other ways to rebuild collagen in your face are through microneedling, platelet rich plasma therapy, Dermal and facial fillers, chemical peels and skin resurfacing lasers.
Unprotected sun exposure is the number one culprit for aging, damaged skin.
UV damages the skin by entering the dermis (the middle layer of skin) and breaking collagen down faster. UV also causes free radicals which break down collagen further by increasing the enzymes in the skin.
And when possible you should avoid sugar and choose foods that boost collagen such as nutrient-rich leafy greens, citrus, and cruciferous vegetables (broccoli, cauliflower).
These foods contain high levels of Vitamin C and Sulphur, both of which are essential to healthy rates of collagen production.
Initial results from collagen restoration treatments are usually visible immediately.
Although, new collagen growth can take anywhere from four to 12 weeks to complete.
Keep in mind that while certain procedures can be very effective at restoring and replacing collagen, these results aren't permanent.
Ultherapy is an excellent collagen treatment for the face.
It is the first and only FDA-cleared and Health Canada-approved non-surgical procedure that tightens and lifts the skin.
It works by harnessing focused ultrasound energy to stimulate and kickstart the body's natural healing process to produce collagen.