I have some tiny pores on my nose, and recently started using copper peptides. They have definitely improved the texture of my skin and shrunk the pores! You have to be cautious with the dosage though, and start very low.
Other than that: supping with gelatine can only help.
"I think the basic anti-aging diet is also the best diet for prevention and treatment of diabetes, scleroderma, and the various "connective tissue diseases." This would emphasize high protein, low unsaturated fats, low iron, and high antioxidant consumption, with a moderate or low starch consumption.
In practice, this means that a major part of the diet should be milk, cheese, eggs, shellfish, fruits and coconut oil, with vitamin E and salt as the safest supplements."
- Ray Peat