Proper hydration, nutrition, and sleep (overall general health) are the most important. The next is establishing a good skin hygiene routine to keep the skin healthy and clean. Products infused with collagen may be shown to be effective, but really, collagen molecules are too large to penetrate skin, so focusing on products that improve the overall health of skin would be a better investment. Many skin products cannot penetrate the skin deeply and serve as a protective barrier. Any kind of stimulation, like massage or dry skin brushing, to improve circulation will affect collagen production.
Most methods of skin exfoliation, removing top layers of dead skin cells, will increase collagen production. There are two types: mechanical and chemical. Both have pros and cons. Mechanical methods are usually abrasive materials, such as exfoliating beads found in some products and microdermabrasion systems, pumice stones or brushes. There is a large risk of damaging the skin by removing larger chunks than intended when using products with too large granules, also scarring and infection are risks. However, it’s still less risky than using chemical exfoliation. The smaller the granule, the more uniform the layer of skin removed will be. Overusing or misusing exfoliating products are probably the number one reason for the permanent enlargement of pores! I’ve been using Neutrogena’s Microdermabrasion system for a few years, the pads are loaded with very tiny crystals and you can use it based on need- the refills are also very affordable. I occasionally use a boar brush on my skin before moisturizing; it also helps to improve circulation, which improves collagen production. There are also many other methods I’ve not tried, like laser therapy, skin leveling uses a dermablade that pokes hundreds of tiny holes into the skin or another method where a razor blade is moved across the skin by an aesthetician. Any sort of waxing or shaving also exfoliates, if you have ever wondered why men often look younger, shaving their faces does that!
Chemical exfoliation is often how the most expensive anti-aging products work over many uses. Many of the working ingredients in beauty cleansers and lotions are heavily diluted alpha hyroxy acids. Stronger acids are mainly used in the form of a chemical peel and remove more layers than mechanical methods. With these methods, you are injuring the skin, so that a newer layer will form (also increasing collagen production). I tend to be harsh to my skin and accumulate a lot of sun damage through tanning during warm months, so have begun to do my own chemical peels at home (common). I’ve had success with removing damage twice so far using 30% trichloroacetic acid and cutting glycolic acid into lotions. They can be quite painful, so if you’ve not had one before, I advise having an aesthetician or dermatologist perform at least the first one and reviewing some basic chemistry first. If the burn is non-uniform, then the areas that lag behind in healing can scar and an area can become infected. If you don't have issues with being frugal in some areas or needing to do things yourself, then better to have professionals do it! Of course, I'm not condoning suntanning, I know preventing sun damage and using SPF inadvertently means better skin health and collagen production, best to not do that...
Unfortunately, none of this applies to the eye area, the skin there is too thin for mechanical exfoliation and acids aren’t supposed to be used near the eyes. I don’t wear much foundation (often agitates my skin), but use eye and lip makeup almost daily, often heavily. Constantly applying and removing eye makeup is like a double whammy to the collagen and structural support around the eyes, all that tugging takes a toll! I use a light scrub on my lips daily before applying a stain, which works out well. But, the eye area still presents a problem for me and I’ve yet to find a suitable long-term solution! I’ve often been warned that I could be traded off for a "newer model” if I’m not careful. It's as if my eyes are moving downward at a rate of 3mm a year! If you find any tips about improving collagen production in the eye area and preventing eye sagging/wrinkles then I would be happy to know about it!