Fish oil is the most commonly cited & advertised...more
Omega-3 fatty acids are well-known to improve skin health, in large part due to the fact that they increase your overall cardiovascular health. Good bloodflow increases the amount of nutrients that can reach your skin, thus keeping skin healthy. Fish oil is the most commonly cited & advertised source of Omega-3 fatty acids, but that's because it's cheap to produce in pill form. Flaxseed oil, however, actually has six times the amount of Omega-3 fatty acids that fish oil does.
I love to take faxseed, both the oil and milled as well. It's perfect on salads!