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Can I take fish oil before workout?

By George Thomas. Published 22 December 2026, updated 22 December 2026. Label figures and prices checked on the update date.

The short answer

You can, and the pre-workout stomach gives two reasons not to. Reflux: a softgel taken without food before training floats in an empty stomach and refluxes as you bend, brace and lie on a bench. Gastric emptying: fat slows the stomach's emptying, so an oil shortly before a session sits in the stomach through it. And the softgel does nothing for the session, working by months of membrane residence. It belongs to the post-training or evening meal.

  • Reason one: refluxa fasted softgel floats and refluxes as you bend, brace and lie flat on a bench
  • Reason two: gastric emptyingfat slows emptying more than carbohydrate or protein: an oil before a session sits through it
  • The session effectnone: omega-3 works by months of membrane residence; no acute effect
  • The better anchorthe post-training meal or dinner: fat to absorb with, an upright hour, a habit that keeps
Futuro Labs Omega 3 Fish Oil, 90 mini softgel bottle

Our brand: the worked example on this page

Futuro Labs Omega 3 Fish Oil

  • 17p a day
  • 90 softgels, 1 softgel daily
  • Lab tested
  • Made in the UK

View on Amazon UK, £14.99 Full label breakdown

The softgel after the session, not before it: Futuro Labs Omega 3 Fish Oil on Amazon UK, 1 softgel with food, 180mg EPA and 120mg DHA, 90 for £14.99 at 17p. Full label breakdown. The after-workout page is here; the empty-stomach page on the empty stomach page.

You can, and the two reasons the pre-workout stomach gives not to

Can I take fish oil before a workout is answered you can, since nothing about a softgel before training is dangerous, and then by the two reasons the pre-workout stomach gives not to, which together make the pre-training hour the worst on the day's clock for a fish oil. Reason one, reflux: a softgel taken without food an hour before training, as many lifters take everything, dissolves in an empty stomach where the oil floats, and a training session is an hour of bending to a bar, bracing against a belt, lying flat on a bench and inverting under a rack, every one of which presses or tips the stomach's contents against the oesophageal junction, so the fishy burp arrives mid-set, the reflux-and-posture literature's finding applied to a squat, and a fasted pre-workout softgel is the surest way to taste fish oil during a session. Reason two, gastric emptying: fat slows the stomach's emptying more than carbohydrate or protein do, which is why pre-training meals are built low in fat and eaten an hour or two out, and an oil, or a fatty meal a softgel is taken with, shortly before a session leaves more in the stomach during it, a heavy, sloshing feeling under a bar and a session in which the gut is competing with the muscles for blood, the gastric emptying literature's advice against fat before exercise, so the fix for reason one, take it with food, creates reason two if the food is fatty and the session is near. A softgel with a fatty breakfast three hours before an evening session is fine on both counts; a softgel with or without food in the hour before is not.

The session effect, which is none, the better anchors, and the hour filed

The session effect settles the question, because there is none: omega-3 works by building EPA and DHA into cell membranes over three to four months of daily intake, the index kinetics' clock, and a single softgel has no acute effect on a session, no energy, no endurance, no strength, no reduced soreness on the day, the after-workout page's finding that a fish oil is the slowest-acting supplement on the shelf, so a softgel before training buys the reflux and the slow stomach and nothing in return, the same softgel joining the same months-long pool whenever it is taken. The better anchors are the two that have fat and an upright hour: the post-training meal, which is usually fatty and reliably eaten and gives the softgel the fat to absorb with after the session rather than the stomach to slosh in during it, and the evening meal, which does the same and anchors rest days too, either of them the habit pages' fixed point and neither near a bar. A reader whose pre-workout ritual includes a handful of tubs takes the creatine in the shake, since creatine cares nothing for the hour, and moves the fish oil out of the handful to the plate after. A reader who has been taking fish oil before training for years without a burp has a triglyceride oil and a forgiving stomach and loses nothing by moving it anyway, since the session gained nothing from it. The hour filed: fish oil before a workout can be taken and should not be, the fasted softgel refluxing under a bar and the fed one slowing the stomach, with no session effect to justify either, and the worked example being the softgel after the session or with dinner, one at 17p, £14.99 for 90.

Fish oil before a workout, the stomach's case
The itemThe findingThe consequence
A fasted softgel before trainingOil floats; bending, bracing and benching press it against the junctionThe fishy burp mid-set
A softgel with a fatty meal before trainingFat slows gastric emptyingA heavy stomach through the session
The session effectNone: months of membrane residence, no acute effectNothing bought for the reflux
Three hours out with a fatty breakfastFine on both countsThe exception
The post-training mealFatty, eaten, uprightThe better anchor on training days
DinnerThe same, plus rest daysThe default

The verdict, a softgel that gains nothing before a session and costs a burp

Can I take fish oil before a workout: you can, and the pre-workout stomach gives two reasons not to, a softgel taken fasted an hour before training floating in an empty stomach and refluxing as you bend, brace and lie on a bench, and a softgel taken with a fatty meal near a session slowing the stomach's emptying so the meal sits through it, with no session effect to justify either since omega-3 works by months of membrane residence and a single softgel does nothing acute, so the softgel belongs to the post-training meal or dinner, where it has fat to absorb with, an upright hour and a habit that keeps. The softgel after the session: Futuro Labs Omega 3 Fish Oil, one softgel with food, 180mg EPA and 120mg DHA, 90 for £14.99 at 17p a day.

What to check on the label

  • Keep a fasted softgel out of the pre-workout hour: it refluxes under a bar.
  • Keep fat out of the pre-workout meal: it slows the stomach.
  • Expect nothing from a softgel for the session: months, not minutes.
  • Anchor to the post-training meal or dinner: fat and an upright hour.
  • Leave creatine in the shake: it cares nothing for the hour.

Our brand

The worked example: Futuro Labs Omega 3 Fish Oil

Futuro Labs Omega 3 Fish Oil: 1 softgel daily with food, 1000mg fish oil providing 180mg EPA and 120mg DHA (300mg combined), 90 softgels for £14.99, 17p a day, lab-tested purity, UK GMP made. Gelatin shell, so not vegetarian.

Fish oil per softgel
1000mg
EPA / DHA per softgel
180mg / 120mg (300mg combined)
Serving
1 softgel a day
Bottle
90 softgels, 90 days
Price
£14.99 (17p a day)
Softgel
mini softgel, no fishy taste
View on Amazon UK, £14.99 Full label breakdown
Futuro Labs Omega 3 Fish Oil, 90 mini softgel bottle

Questions people also ask

Is it okay to take omega-3 before a workout?

It is not harmful, but the pre-workout hour is the worst on the clock for a fish oil: a fasted softgel refluxes as you bend, brace and bench, a softgel with a fatty meal slows the stomach through the session, and omega-3 does nothing acute for the session anyway, so it goes with the post-training meal or dinner.

Does fish oil before the gym give you energy or endurance?

No: omega-3 works by building EPA and DHA into cell membranes over three to four months with no acute effect from a single softgel, so a pre-workout softgel provides no energy, endurance, strength or reduced soreness on the day.

Why do I burp fish oil during training?

A softgel taken without food before a session floats in an empty stomach, and bending to a bar, bracing against a belt and lying flat on a bench press the stomach's contents against the oesophageal junction, so the fishy burp arrives mid-set; a softgel with the post-training meal avoids it.

Can I take fish oil with my pre-workout meal?

Only if the meal is a few hours out: fat slows gastric emptying more than carbohydrate or protein, so an oily meal shortly before a session sits in the stomach through it, the reason pre-training meals are built low in fat, while a fatty breakfast three hours before an evening session is fine.

When is the best time to take fish oil if I train in the evening?

With the post-training meal, which is usually fatty, reliably eaten and followed by an upright hour, or with dinner on rest days, the same softgel joining the same months-long pool at either.

Sources

  1. The reflux and posture literature: lying flat within an hour or two of eating, and of taking an oil, increases reflux because the stomach's contents sit against the oesophageal junction, so a fish oil softgel taken at the pillow refluxes more than the same softgel taken with an upright meal. PubMed record
  2. The gastric emptying literature: fat slows gastric emptying more than carbohydrate or protein, so a fatty meal or an oil taken shortly before exercise leaves more in the stomach during the session and is the usual advice to avoid before training. PubMed record
  3. The omega-3 index kinetics literature: red-cell EPA and DHA rise over three to four months of daily intake and fall over a similar period after stopping, the index changing on a clock of months rather than days, with no acute effect of a single dose. PubMed record
  4. Classic absorption work on fish oil ethyl esters: uptake is markedly higher when ethyl ester omega-3 is taken with a high-fat meal, narrowing the gap to triglyceride forms. PubMed record