Which Retin-A Cream Is Best For Wrinkles----0.1% or 0.05%?

The short answer to your question is to use the dose that is working for you.  If that is 0.1% then go for it! Many people cannot tolerate that high of a dose because it causes redness and peeling but if your skin has acclimated and you are not experiencing side effects it is absolutely fine.  Retin A, as a topical form of vitamin A, is great for your skin.  Make sure your are also protecting your skin with sunscreen and an antioxidant.
Keep up the good work!
Best,
Dr. Amy

If you have been tolerating the higher dose retinoid for your wrinkle treatment, I see no problem with continuing to use it.  It's obvious that your skin has become tolerant to the higher dose, o switching to a lower concentration would be unnecessary.  

Both Retin-A 0.05% and Retin-A 0.1% will be effective for helping with fine lines, wrinkles, and providing overall anti-aging benefits. The dose depends on how well you can tolerate the product. If you are not experiencing any of the typical side effects of Retin-A (redness, flaking, itchy, dry skin), then you can apply the 0.1% cream to see if that works better for you. Best of luck!