The following is off topic. I was bored, so I wrote it to have something to do.
Omega 3 does have muscle preserving properties. Omega 3 along with protein is used to reduce muscle wasting in cancer patients. It probably is helpful in building muscle in healthy individuals. Several years ago I started taking fish oil for the prevention of age related diseases such as cardiovascular disease. I noticed that in the morning my muscles and joints did not ache as much. I'm sure you young guys don't have this problem yet, but your turn is coming.
This may just be the placebo effect, but I still feel better. Omega 3 definitely has anti-inflammatory properties and is used by rheumatologists to treat rheumatoid arthritis and lupus.
For the best health, the ratio of omega 3 to omega 6 in the diet should be approx 1 to 4 (experts disagree about the best ratio, and some say a ratio of 2 to 1 is the better). If there is too much omega 6, bad things start to happen. The average Western diet has as a ratio of 1 to 20
Too much Omega 6 shifts metabolism toward inflammation. Inflammation has been theorized as a cause of many diseases, here is a short list: heart attacks, thrombotic stroke, arrhythmia, arthritis, osteoporosis, inflammation, mood disorders, obesity, and cancer. (1)
It gets more confusing now. Not all forms of omega 6 fatty acids increase inflammation. Some forms reduce inflammation and are sold as supplements. Omega-6 fatty acids are available in supplemental oils that contain linoleic acid (LA) and gamma linolenic acid (GLA), such as evening primrose (Oenothera biennis) and black currant (Ribes nigrum) oils. Spirulina (often called blue-green algae) also contains GLA.
Although not a mineral, vitamin D deficiency can cause muscle weakness. Many children are found to have low vitamin D levels because of the use of sunscreen and not enough sun exposure. Many children no longer play in the sun, but would rather stay inside playing video games, eating too much and getting fat. In the elderly, vitamin D deficiency and it's associated muscle weakness contributes to frequent falls and fractures. The elderly get little sun and have poor appetites with inadequate vitamin D intake. It is a recommendation that one should supplement daily with oral vitamin D. The appropriated dose is debatable.
Phosphate (PO4) deficiency is one of the more common causes of nutritional muscle weakness. You can see this in chronic alcoholics with malnutrition.
If you eat well and the diet is balanced there should be no problems.
1.Calder, Philip C. (June 1, 2006). "n−3 polyunsaturated fatty acids, inflammation, and inflammatory diseases". American Journal of Clinical Nutrition (American Society for Nutrition) 83 (6, supplement): 1505S–1519S. PMID 1684186