Omega-3s: Choosing Between NeuroImmune™ DHA 900 and Oh My Cod! Liver Oil

Omega-3 fatty acids play a foundational role in immune health, brain development, and nervous system function, especially during pregnancy, infancy, childhood, and periods of rapid growth (1).✝ But not all omega-3 supplements are interchangeable, and choosing the right one depends on what your body (or your child’s body) needs most right now.

Two of the most commonly used omega-3 options in my practice are NeuroImmune™ DHA 900 and Oh My Cod! Liver Oil. Both provide high-quality omega-3s, but they have some differences, too! This article will walk you through how each formula works, what makes them different, and how to decide which is the better fit for your family.

Omega-3 fatty acids, particularly DHA (docosahexaenoic acid) and EPA (eicosapentaenoic acid), are structural components of cell membranes and are especially concentrated in the brain, nervous system, eyes, and immune cells (2).

Adequate omega-3 intake supports:

• Normal brain and nervous system development (3)✝
• Healthy immune signaling and inflammatory balance (4)✝
• Visual development and eye health (5)✝

Because dietary intake of omega-3s is often low, especially in children, supplementation can be an important tool for foundational support.

To learn more, read this article: Omega Fatty Acids: Nutritional Sources & Health Benefits Explained

Not all omega-3 supplements are created equal. Because fish oils are derived from marine sources, purity and testing standards are critical, especially when products are used by children and taken during pregnancy.

Both NeuroImmune™ DHA 900 and Oh My Cod! Liver Oil are third-party tested for purity and potency and are sourced to meet strict quality standards. Each formula is tested to ensure it is free from harmful contaminants such as heavy metals and other environmental toxins, and both are manufactured with a focus on ultra-pure, high-quality omega-3s.

To learn more about how we test our products, click here.

NeuroImmune™ DHA 900 is a high-DHA omega-3 formula designed to support nervous system development and immune function, without added fat-soluble vitamins.✝

Best For: 

• Brain and nervous system development ✝
• Cognitive support and focus ✝
• Immune system support through omega-3 intake ✝
• Individuals who already supplement vitamin A and D separately

What Makes It Unique: 

NeuroImmune™ DHA 900 provides a concentrated dose of DHA, along with EPA and other omega-3s, in triglyceride (TG) form for absorption. Because it does not contain vitamin A or vitamin D, it allows for greater flexibility when layering supplements.

Oh My Cod! Liver Oil is a traditional cod liver oil, providing omega-3 fatty acids along with naturally occurring vitamin A and vitamin D.

Best For: 

• Families looking for broader foundational support ✝
• Immune system support during seasonal challenges ✝
• Supporting normal inflammatory balance ✝
• Individuals not already supplementing vitamin A or D  
• Families who prefer not to take multiple individual supplements 

What Makes It Unique:    

Cod liver oil naturally contains vitamin A and vitamin D, two fat-soluble vitamins that play critical roles in immune function (6), mucosal barrier integrity (7), and nervous system (8,9) signaling.✝

Oh My Cod! Liver Oil provides:

• Omega-3 fatty acids (including DHA and EPA)
• Naturally occurring vitamin A 
• Naturally occurring vitamin D 

This combination makes it an excellent foundational supplement, especially for families who want immune, brain, and nervous system support in one product.✝

To learn more about vitamins A and D, read these articles: 

• The Benefits of Vitamin A & Pediatric Dosing
• Top Sources of Vitamin D + Kid Friendly Recipes

Yes, NeuroImmune™ DHA 900 and Oh My Cod! Liver Oil can be used together, although it’s not usually necessary as both supply many of the same nutrients. Combining the two does not increase vitamin A or vitamin D intake beyond what’s provided by the cod liver oil alone, since NeuroImmune™ DHA 900 does not contain vitamins A or D. When used alongside a cod liver oil, the primary effect is an increase in total omega-3 intake, particularly DHA, without increasing vitamin A or vitamin D exposure.

This approach can be helpful in certain situations, such as when a child is already using cod liver oil for foundational support but could benefit from additional DHA to support brain, eye, or nervous system development, without exceeding their current vitamin A or D intake from cod liver oil alone.

Nutrient Comparison NeuroImmune™ DHA 900 vs Oh My Cod! Liver Oil (per 1 teaspoon / 5 mL)

Because both supplements come in liquid form, they allow for flexible dosing, making it easier to adjust amounts based on age, size, and individual needs rather than relying on fixed capsule doses.

DHA does not have an established upper limit for children, but higher amounts aren’t always better and may occasionally cause digestive upset. For many families, choosing one product that best matches their current goals is sufficient.

Both NeuroImmune™ DHA 900 and Oh My Cod! Liver Oil are high-quality omega-3 supplements, but they serve slightly different purposes. NeuroImmune™ DHA 900 provides targeted DHA support for the brain, eyes, and immune system and offers flexibility for families who already supplement vitamins A and D separately.✝ Oh My Cod! Liver Oil takes a more traditional, comprehensive approach by pairing omega-3s with naturally occurring vitamins A and D to support foundational immune and nervous system health.✝

When it comes to choosing the best omega-3 supplement for your child, the right option depends on your goals, your current supplement routine, and where your body (or your child’s body) needs the most support at this stage. 

1. Fu Y, Wang Y, Gao H, Li D, Jiang R, Ge L, Tong C, Xu K. Associations among Dietary Omega-3 Polyunsaturated Fatty Acids, the Gut Microbiota, and Intestinal Immunity. Mediators Inflamm. 2021 Jan 2;2021:8879227. doi: 10.1155/2021/8879227. PMID: 33488295; PMCID: PMC7801035.
2. Krupa KN, Fritz K, Parmar M. Omega-3 Fatty Acids. [Updated 2024 Feb 28]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2025 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK564314/ 

3. Dighriri IM, Alsubaie AM, Hakami FM, Hamithi DM, Alshekh MM, Khobrani FA, Dalak FE, Hakami AA, Alsueaadi EH, Alsaawi LS, Alshammari SF, Alqahtani AS, Alawi IA, Aljuaid AA, Tawhari MQ. Effects of Omega-3 Polyunsaturated Fatty Acids on Brain Functions: A Systematic Review. Cureus. 2022 Oct 9;14(10):e30091. doi: 10.7759/cureus.30091. PMID: 36381743; PMCID: PMC9641984.

4. Bodur M, Yilmaz B, Ağagündüz D, Ozogul Y. Immunomodulatory Effects of Omega-3 Fatty Acids: Mechanistic Insights and Health Implications. Mol Nutr Food Res. 2025 May;69(10):e202400752. doi: 10.1002/mnfr.202400752. Epub 2025 Mar 30. PMID: 40159804; PMCID: PMC12087734.

5. Campoy C, Escolano-Margarit MV, Anjos T, Szajewska H, Uauy R. Omega 3 fatty acids on child growth, visual acuity and neurodevelopment. Br J Nutr. 2012 Jun;107 Suppl 2:S85-106. doi: 10.1017/S0007114512001493. PMID: 22591907.

6. Džopalić T, Božić-Nedeljković B, Jurišić V. The role of vitamin A and vitamin D in modulation of the immune response with a focus on innate lymphoid cells. Cent Eur J Immunol. 2021;46(2):264-269. doi: 10.5114/ceji.2021.103540. Epub 2021 Aug 7. PMID: 34764797; PMCID: PMC8568032.

7. Cantorna MT, Snyder L, Arora J. Vitamin A and vitamin D regulate the microbial complexity, barrier function, and the mucosal immune responses to ensure intestinal homeostasis. Crit Rev Biochem Mol Biol. 2019 Apr;54(2):184-192. doi: 10.1080/10409238.2019.1611734. Epub 2019 May 14. PMID: 31084433; PMCID: PMC6629036.

8. Wrzosek M, Łukaszkiewicz J, Wrzosek M, Jakubczyk A, Matsumoto H, Piątkiewicz P, Radziwoń-Zaleska M, Wojnar M, Nowicka G. Vitamin D and the central nervous system. Pharmacol Rep. 2013;65(2):271-8. doi: 10.1016/s1734-1140(13)71003-x. PMID: 23744412.

9. Olson CR, Mello CV. Significance of vitamin A to brain function, behavior and learning. Mol Nutr Food Res. 2010 Apr;54(4):489-95. doi: 10.1002/mnfr.200900246. PMID: 20077419; PMCID: PMC3169332.