When choosing a fish oil supplement, here are some points to consider:

1. Quality: Opt for high-quality fish oil, preferably from sustainable and pure sources. Be demanding about the manufacturing standards applied to the fish oil supplements you choose.

2. Omega-3 Concentration: Check the amount of omega-3 fatty acids, particularly EPA and DHA, present in each dose of fish oil. Ensure that the concentration is adequate to meet your needs. Concentrations up to 95% of fish oil provide high-quality omega-3s.

3. Examine the Form: The rTG type is preferable. Purity and absorption rate are the best. The absorption rate, from highest to lowest, is as follows: rTG type > TG type > EE type. (The rTG type combines the high concentration of the EE type and the high absorption rate of the TG type).

4. Form: Fish oil is available in different forms, such as capsules, softgels, and liquids. Choose the form that suits you best based on your preferences and ease of taking them.

5. Freshness: The freshness of fish oil is important to avoid any rancidity. Check the expiration date and look for products that guarantee proper preservation.

6. Certification: Look for fish oil certified by third parties, such as the IFOS (International Fish Oil Standards Program), which guarantees the quality and purity of the product.

7. Allergens: If you have food allergies or intolerances, check the labels to ensure that the fish oil does not contain allergens to which you are sensitive.

It is always recommended to consult a healthcare professional before starting to take fish oil supplements, as they can help you determine the appropriate dosage based on your specific needs.