- Aug 15, 2018
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Fish oil is one of the longest-running supplements in lifting culture, and unlike a lot of the old staples, it actually has a plausible mechanism and some genuinely interesting human data behind it — along with the usual pile of overclaiming.
The most interesting findings come from Gordon Smith's group at Washington University. In studies published in the American Journal of Clinical Nutrition (2011) and Clinical Science, eight weeks of omega-3 supplementation (roughly 1.9 g EPA + 1.5 g DHA daily) increased the muscle protein synthetic response to insulin and amino acids in both younger and older adults — essentially making muscle more sensitive to the anabolic signal from a meal. That effect is most relevant for older lifters, where "anabolic resistance" blunts the response to protein, and it's one of the more credible supplement findings in the literature. That said, increased acute synthesis rates don't automatically convert into measurable extra muscle over months, and long-term hypertrophy trials in trained lifters are scarce and unimpressive so far.
On soreness and recovery, the evidence is friendlier but modest. Meta-analyses of omega-3 supplementation and exercise-induced muscle damage (for example, a 2021 systematic review in the Journal of the International Society of Sports Nutrition) find small reductions in delayed-onset soreness and some inflammatory markers, with a lot of variation between studies in dose, duration, and the exercise protocol used. Effects on actual strength recovery are inconsistent — you might feel a bit less beat up without getting your performance back any faster.
Dose and duration matter more here than with most supplements: the positive studies typically used around 2–3 g/day of combined EPA and DHA for at least 4–8 weeks, because omega-3s work by being incorporated into cell membranes over time, not by an acute effect on training day. Eating fatty fish a couple of times a week lands you in a similar range without the capsules. If you're supplementing, check the label for actual EPA+DHA content — "1000 mg fish oil" often means only ~300 mg of the active fats.
Anyone here running fish oil long-term — for the muscle angle, joints, or general health — and has anyone tested the difference after stopping for a while?
The most interesting findings come from Gordon Smith's group at Washington University. In studies published in the American Journal of Clinical Nutrition (2011) and Clinical Science, eight weeks of omega-3 supplementation (roughly 1.9 g EPA + 1.5 g DHA daily) increased the muscle protein synthetic response to insulin and amino acids in both younger and older adults — essentially making muscle more sensitive to the anabolic signal from a meal. That effect is most relevant for older lifters, where "anabolic resistance" blunts the response to protein, and it's one of the more credible supplement findings in the literature. That said, increased acute synthesis rates don't automatically convert into measurable extra muscle over months, and long-term hypertrophy trials in trained lifters are scarce and unimpressive so far.
On soreness and recovery, the evidence is friendlier but modest. Meta-analyses of omega-3 supplementation and exercise-induced muscle damage (for example, a 2021 systematic review in the Journal of the International Society of Sports Nutrition) find small reductions in delayed-onset soreness and some inflammatory markers, with a lot of variation between studies in dose, duration, and the exercise protocol used. Effects on actual strength recovery are inconsistent — you might feel a bit less beat up without getting your performance back any faster.
Dose and duration matter more here than with most supplements: the positive studies typically used around 2–3 g/day of combined EPA and DHA for at least 4–8 weeks, because omega-3s work by being incorporated into cell membranes over time, not by an acute effect on training day. Eating fatty fish a couple of times a week lands you in a similar range without the capsules. If you're supplementing, check the label for actual EPA+DHA content — "1000 mg fish oil" often means only ~300 mg of the active fats.
Anyone here running fish oil long-term — for the muscle angle, joints, or general health — and has anyone tested the difference after stopping for a while?