Question explored with the scientific record
Should a 19 year old take extra virgin rat fish liver oil daily as a supplement
The evidence here is too thin and off-target to answer whether a 19-year-old should take extra virgin ratfish liver oil daily.
None of the retrieved studies actually tested ratfish liver oil in a healthy young adult for daily supplementation. One 1981 lab study looked at compounds derived from ratfish liver oil on isolated human white blood cells in a dish [1]. That tells you about a mechanism, not about what happens when a person swallows the oil every day for months. The rest of the evidence is about standard fish oil (omega-3s from common fish like salmon or sardines) in older adults with heart disease or after surgery [2][3][4]. That is a different population, a different product, and a different question.
For standard fish oil in older adults, the safety record from several trials is fairly clean: no big increase in bleeding even at high doses [2], and serious side effects were rare and about the same as placebo [4]. But "about the same as placebo" in a trial is not proof of safety for a lifetime of daily use starting at age 19. No study in this set followed a healthy teenager for years.
Mechanistically, omega-3s can lower inflammation markers like CRP and IL-6 [5], which sounds good on paper. But the same review notes the effect is small or absent in people who are not inflamed to begin with [5]. A healthy 19-year-old is exactly that kind of person. You might be paying for a lab change you cannot feel and may not need.
My call: there is no evidence that extra virgin ratfish liver oil provides any benefit to a healthy 19-year-old, and no long-term safety data to lean on. Confidence: low.
Sources used 5
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Saturated and unsaturated 1-O-alkyl-2-O-acetoyl-sn-glycero-3-phosphocholines derived from ratfish liver oil: effect on human leukocyte migration
This study investigates the effects of saturated and unsaturated 1-O-alkyl-2-O-acetoyl-sn-glycero-3-phosphocholines derived from ratfish liver oil on human leukocyte migration, demonstrating that unsaturated compounds are more potent stimulants of neutrophil chemokinesis and che…
DOI: 10.1016/0009-3084(81)90064-5 -
Expert Opinion: Omega-3 Fatty Acids and Bleeding—Cause for Concern?
This commentary evaluates the evidence regarding the risk of clinically significant bleeding associated with omega-3 fatty acid supplementation, concluding that the benefits of triglyceride lowering outweigh any theoretical risks of increased bleeding.
DOI: 10.1016/j.amjcard.2006.11.021 -
Omega-3 polyunsaturated fatty acid supplementation in the prevention of cardiovascular disease
This clinical review systematically evaluates randomized trials and meta-analyses on omega-3 polyunsaturated fatty acid (PUFA) supplementation for prevention of cardiovascular disease, concluding no meaningful benefit beyond standard therapy and highlighting potential bleeding r…
DOI: 10.1177/1715163516640812 -
Fish oil administration in older adults with cardiovascular disease or cardiovascular risk factors: Is there potential for adverse events? A systematic review of the literature
This systematic review evaluates the potential adverse events associated with fish oil supplementation in older adults with cardiovascular disease or risk factors, finding that serious adverse events are infrequent and not significantly different between intervention and control…
DOI: 10.1016/j.ijcard.2013.05.054 -
Anti-inflammatory effects of omega-3 fatty acids: Evidence from circulating biomarkers and inflammatory gene-expression studies
This narrative review reports that omega-3 supplementation can reduce inflammatory biomarkers and downregulate inflammatory gene expression, with effects depending on dose, formulation, and baseline inflammatory status.
DOI: 10.65221/0167