Reviewed by Jessie, BSc Biomedical Science · Formulation Lead, Purest Kids
The question parents rarely think to ask
You checked the DHA dose. You looked at the source. But there is one more variable that determines how much of that omega-3 actually reaches your child’s brain — and most supplement labels bury it in the small print, if they mention it at all. That variable is the molecular form of the omega-3.
Two forms, one meaningful difference
Most omega-3 supplements are produced in one of two forms: triglyceride (TG) or ethyl ester (EE).
TG form is the natural form — how omega-3 occurs in whole food sources like fatty fish and algae. The body recognises it and incorporates it into cell membranes with minimal effort.
EE form is a processed version created during the concentration of fish oil. It is cheaper to produce and more common in supplement manufacturing. But the body has to convert it back to TG form before it can use it — and that conversion is incomplete. Research suggests that TG-form omega-3 is absorbed approximately 70% better than EE-form under equivalent conditions.
Why it matters more for children
In adult supplementation, absorption inefficiency can partly be compensated for by taking higher doses. In children, you are constrained by appropriate dosage ranges and palatability — you cannot just give more. That makes the form of omega-3 significantly more consequential. A 450mg DHA dose in TG form delivers meaningfully more usable DHA than a nominally equivalent dose in EE form.
How to check your supplement’s form
It should be on the label or the product page. Look for “triglyceride form”, “TG-form omega-3”, or “re-esterified triglyceride (rTG)”. If the label says “ethyl ester” or simply “omega-3 concentrate” without specifying the form, it is likely EE. If the supplement does not mention the form at all, that is itself informative.
Purest Kids Omega-3 uses TG-form omega-3, sourced from algae oil. It is on the label because that is information parents should have.
See Omega-3 Mango Burstlets — TG-form, 450mg DHA per serve →
References
- Dyerberg J, et al. “Bioavailability of marine n-3 fatty acid formulations.” Prostaglandins, Leukotrienes and Essential Fatty Acids, 2010.
- Schuchardt JP, et al. “Incorporation of EPA and DHA into plasma phospholipids in response to different omega-3 formulations.” Lipids in Health and Disease, 2011.
- Offermanns S. “Triglyceride versus ethyl ester form of omega-3 supplements.” Current Pharmacology Reports, 2016.