Reviewed by Jessie, BSc Biomedical Science (IMU Malaysia) · Formulation Lead, Purest Kids
Most children's omega-3 supplements are made from fish oil. It is the default, and most parents do not think to question it. But there is a cleaner, more sustainable source that delivers the same DHA without the fishy smell, the contamination risk, or the daily battle to get your child to take it. Understanding why requires a short detour into marine biology.
Fish do not make omega-3
This surprises most people. Fish are rich in DHA and EPA not because they produce these fatty acids themselves, but because they eat microalgae that do. The omega-3 accumulates up the food chain, concentrating in fish tissue over time.
Which means that when you give your child a fish oil supplement, you are getting omega-3 that passed through a fish to get there. When you give them algae oil, you are going straight to the original source.
What gets lost in the fish oil process
Fish oil production involves catching fish, processing them at high temperatures, and concentrating the oil. That process introduces problems that algae oil avoids entirely.
The first is oxidation. Fish oil degrades when exposed to heat, light, or air. Oxidised fish oil is not just ineffective — it may be counterproductive. The fishy smell that most children's fish oil products try to mask is often a sign of oxidation, not just natural odour. A 2013 study in the journal JAOCS found that the majority of commercially available fish oil supplements tested showed signs of oxidation above recommended thresholds.
The second is contamination. Fish accumulate not just omega-3 but also environmental pollutants including heavy metals and PCBs. Reputable fish oil manufacturers filter for these, but the risk is inherent to the source. Algae oil bypasses this entirely — microalgae are grown in controlled environments with no exposure to ocean pollutants.
The taste problem, and why it matters for children
A supplement your child will not take is a supplement that does nothing. The fishy taste and smell of fish oil is one of the most common reasons children refuse omega-3. Algae oil has a neutral flavour profile. It does not smell or taste of fish, which makes it possible to create a genuinely palatable supplement without relying on heavy masking flavours or sugar.
Sustainability
Global fish stocks are under significant pressure. A supplement industry that sources from wild-catch fish adds to that demand. Microalgae are fast-growing, require no ocean resources, and can be produced in land-based facilities. The environmental footprint is substantially lower.
Is the DHA the same?
Yes. DHA is DHA regardless of source. The molecular structure is identical whether it comes from a sardine or a microalgae cell. Multiple studies have confirmed equivalent bioavailability between algae-derived DHA and fish oil DHA, including a comparative study published in Lipids (Arterburn et al., 2008) that found algae oil raised blood DHA levels as effectively as cooked salmon.
Each serve of Omega-3 Mango Burstlets delivers 450mg DHA from algae oil — no fish, no fishy taste, and no compromise on dose. For more on what a meaningful DHA dose looks like, see How Much DHA Does My Child Actually Need?
The bottom line
Algae oil gives your child the same DHA that fish oil provides, sourced more cleanly, with less environmental impact, and without the taste that makes fish oil a daily battle. For most families, once they understand where omega-3 actually comes from, switching is a straightforward decision.
Frequently asked questions
Is algae oil DHA absorbed as well as fish oil DHA?
Yes. Peer-reviewed research has found that algae-derived DHA raises blood DHA levels as effectively as fish oil. The molecular structure of DHA is identical regardless of source, and absorption studies have shown equivalent bioavailability.
Is algae oil suitable for vegetarian children?
Yes. Algae oil contains no animal products and no fish derivatives. It is the only source of preformed DHA that is suitable for vegetarian families (not vegan — the softgel shell contains beeswax). See Is Vegetarian Omega-3 as Good as Fish Oil for Kids? for more detail.
Why do most supplements still use fish oil if algae oil is better?
Fish oil is cheaper to produce at scale because the supply chain is established. Algae oil requires controlled cultivation infrastructure. As consumer awareness has grown, more manufacturers have moved to algae-derived DHA, but fish oil remains the default in mass-market products.
Reviewed by Sonia, BSc Nutrition & Metabolism (University of Sydney, Distinction), Advanced Diploma in Sports Nutrition (Institute of Performance Nutrition).
See Omega-3 Mango Burstlets — 450mg DHA, algae-sourced, mango flavoured →
References
- Comparative Bioavailability of DHA and EPA from Microalgal and Fish Oil in Adults. International Journal of Molecular Sciences, 2025. PMC
- Doughman SD, et al. "Omega-3 fatty acids for nutrition and medicine: considering microalgae oil as a vegetarian source of EPA and DHA." Current Diabetes Reviews, 2007. PubMed
- National Institutes of Health. "Omega-3 Fatty Acids — Health Professional Fact Sheet." Office of Dietary Supplements. NIH
- Lenihan-Geels G, et al. "Alternative sources of omega-3 fats: can we find a sustainable substitute for fish?" Nutrients, 2013. PubMed