Partly, yes. The European Food Safety Authority (EFSA) states that for healthy adults, about 250 mg per day of combined EPA and DHA is sufficient to maintain normal heart function. This product, with a dose of 600 mg per day, provides considerably more than this baseline recommendation. However, it doesn't fully replace oily fish, as fish also provide protein and vitamin D, which are not present in the capsule. If your intake of vitamin D and protein is otherwise sufficient, this supplement will cover your EPA and DHA needs.

With a meal that contains at least a little fat. Omega-3 fatty acids are fat-soluble, so the body absorbs them better when taken with food rather than on an empty stomach.

They will probably be beneficial, since recommendations usually call for 1–2 servings of oily fish per week for sufficient omega-3 intake. If you're at the lower end of that, the supplement is a sensible addition. The capsules are primarily a convenient solution for people who don't eat fish often enough, not a complete substitute for a varied diet. It's also important to know that not all fish contain the same amount of omega-3.

Caution is needed here. At very high doses of omega-3 (usually several grams per day), there can be a mild effect on blood clotting, which is particularly important for people taking blood-thinning medication. At a dose such as 600 mg per day, this is generally not a concern for healthy adults, but if you're on such medication, consult a doctor before use.