Is it ok to take collagen supplements (pills) after upper blepharoplasty? Will this help or hinder the scar? I am 48 years old.

A postoperative patient simply needs a balanced diet that may or may not include nutrient supplementation with vitamins as these are co-factors in your healing. I think you can put your “collagen supplement budget” into a good quality skin care. Collagen supplementation does not improve the collagen in your wound per se. The collagen from your diet does not go into your wound in any way. It is first metabolized and broken down like any protein source and then your body will turn it into the proteins that are necessary in your post recovery period. The long story short is that I would not recommend using them as they have no impact on your healing. I am sure your plastic surgeon, if he is board certified, would concur.

Our skin produces its own collagen. Taking a collagen supplement does absolutely nothing to improve or increase our natural collagen production.  I doubt that they have any health benefits at all.  Just use whatever your surgeon recommends after the surgery.  Upper eyelid skin is very thin, and tends to heal beautifully on its own.  

It is ok to taken collagen supplement?  It will be a complete waste of time and money.  They will have absolutely no bearing on your healing.  While it is unlikely they will be harmful, they most certainly will not be helpful.  I would advise you not to take them and to stay away from whoever suggested that you take them.