Herring oil is a Green-Green food. Green-Green foods are safe to eat as a regular part of a diet.
Guideline related quotes related to Fats-Oils, Fish-Oils and Green-Green throughout Geoff Bond's publications.
We only need about one gram each of omega-6 and omega-3 oils. We need to strip out the omega-6 oils to the point where we are only consuming a couple of grams a day at most, and we need to make sure we get at least one gram a day of omega-3 oils. Eating oily fish every day will help you boost your intake of omega-3. ~Paleo in a Nutshell p.41
Good oils share the top of the pyramid, and should be eaten sparingly to reap their health benefits. ... These include oily fish and canola (rapeseed) oil. ~Paleo in a Nutshell p.48
Examples of one serving include 1 teaspoon margarine; 1 tablespoon mayonnaise or spread; 1 teaspoon canola, vegetable, olive, fish, coconut, etc. oil. ~Paleo in a Nutshell p.95
Use 1 tablespoons of “Green-Green” oil at least seven times a week. ~Paleo in a Nutshell p.103
Restrict total fats and oils consumption to 5 tablespoons (80 ml) per day. ~Paleo in a Nutshell p.103
... our modern industrial diets are starved of such omega-3 fish oils, whereas the Eskimo has a superabundance of them. ~Paleo in a Nutshell p.120
Traditionally, the Japanese are Buddhists and, as such, they did not eat animals at all. However, they did eat fish, often raw. By Western standards, it was a high consumption, around 90 g (3.15 oz) per person per day (four times as much as the average American). From this, they got a high consumption of omega-3 fish oil, notably the essential fatty acid eicosapentaenoic acid (EPA). ~Paleo in a Nutshell p.121
Eat no more than 10% of calories as fat/oil. Focus on consumption of bioavailable omega-3 fatty acids, reduce consumption of bioavailable omega-6 fatty acids, and avoid foods with bioavailable "bad" fatty acids. ~Deadly Harvest p.137
Those who have good levels of the omega-3 oils, whether fish oils or alpha-linolenic acid (ALA), have a lower risk of breast cancer. ~Deadly Harvest p.234
Many studies and trials show that when patients consume a normalized intake of essential fatty acids, their schizophrenia is improved. That is, consumption of omega-3 oils is increased and omega-6 oils are sharply reduced to bring them into balance. One of the fish oils, EPA (eicosapentaenoic acid), seems to play a crucial role. ~Deadly Harvest p.258
Studies on Eskimos demonstrate that a high consumption of omega-3 fatty acids (in their case, mainly from fish oils) improve insulin sensitivity and glucose tolerance. These confirm other studies suggesting that insulin sensitivity is improved when omega-3 intake is increased. Follow the Savanna Model and make sure you have the omega-6 to omega-3 intakes in balance. ~Deadly Harvest p.266