Omega-3 Fish Oil: Benefits & Best Supplements in SA (2026)

Reviewed by Precious, One Life Health Consultant — Updated July 2026

What omega-3 actually is

Omega-3 is a family of fats your body needs but can't make on its own — you have to get them from food or a supplement. The two most studied for heart and brain support are EPA and DHA, found mainly in oily fish and algae. There's also ALA, found in plant sources like flaxseed and walnuts, which the body can convert into small amounts of EPA and DHA, though the conversion is inefficient.

Most people asking me about "fish oil" at the counter are really asking about EPA and DHA specifically, so that's worth checking on the label rather than just the total oil content.

Food first, supplement second

If you can get there with food, that's always the better starting point. Salmon, pilchards, mackerel, trout and sardines are good options, and tinned pilchards are an affordable, local way to work oily fish into a weekly meal plan. A supplement is there to fill the gap when fish isn't a regular part of your diet, or when you simply don't enjoy it.

If you're vegetarian or vegan, look for an algae-oil supplement rather than fish oil. Algae is where fish get their omega-3 from in the first place, so it gives you EPA and DHA directly without relying on the body's conversion of ALA.

How to judge fish oil quality

Not all fish oil on the shelf is equal, and the differences matter more than the price tag suggests.

• Check the EPA + DHA amount, not just the total oil. A capsule might list "1000mg fish oil" but only contain 300mg of actual EPA and DHA — the rest is other fats. The combined EPA+DHA figure on the panel is what tells you how concentrated the product is.
• Freshness matters. Fish oil oxidises over time, which is what causes that fishy "repeat" burp and a rancid smell if you open a capsule. A product that smells strongly rancid rather than mildly fishy is past its best — don't use it. Buying from a store with good stock turnover, and storing your bottle in the fridge once opened, both help.
• Look for third-party purity testing where it's stated on the label — this generally covers things like heavy metals, which can accumulate in some fish species.
• Sustainable sourcing. Certifications or sourcing statements on the label (for example, referencing sustainably managed fisheries) are a reasonable way to choose between similar products if that matters to you.

Who tends to benefit most

In my experience at the counter, the people who ask about omega-3 most often fall into a few groups: those wanting general heart and brain support as part of an overall healthy routine, people whose diets are genuinely low in oily fish, and older adults looking at long-term wellness habits. Research suggests EPA and DHA play a role in normal heart and brain function, which is why they're such a common everyday supplement — but it's support for a healthy routine, not a treatment for an existing heart or neurological condition.

If you have a diagnosed heart condition, are on blood-thinning medication, or are pregnant or breastfeeding, please check with your doctor or pharmacist before starting omega-3 supplements, as dosing and interactions need individual guidance.

How to take it

Take fish oil with a meal that contains some fat — it helps with absorption and tends to reduce the fishy aftertaste. Follow the serving size on your specific product's label rather than a generic number, since concentration varies a lot between brands. Consistency is what matters most: a daily habit linked to breakfast or dinner works better than sporadic, high doses.

Give it a few weeks of consistent use before deciding whether it's doing anything for you — this isn't a same-day effect, and expecting one is usually where people get discouraged and stop too early.

Side effects and precautions

The most common niggle is mild digestive upset — burping, a fishy aftertaste, or loose stools, especially at higher doses or on an empty stomach. Taking it with food usually sorts this out.

Because omega-3 can have a mild blood-thinning effect at higher doses, speak to your doctor before combining it with blood-thinning medication, before surgery, or if you have a bleeding disorder. As always, check with a healthcare professional if you're pregnant, breastfeeding, or managing a chronic condition.

Where to buy omega-3 in South Africa

You'll find a range of fish oil and algae-oil supplements — different concentrations, softgels, liquids and chewables — at One Life Health, in-store and online at onelife.co.za. Browse the omega oils and healthy fats collection to compare what's currently in stock.

Three good places to start on our shelf:

• NATROCEUTICS – Omega-3 Pure Wild 60 Capsules (R377.00) — one of our top sellers store-wide; wild-sourced fish oil in a concentrated capsule
• BIOMAX – Purest Omega-3 60 Capsules (R369.00) — the second omega anchor on the shelf, also a store best-seller
• VIVID HEALTH – Omega Oil 90 Capsules (R237.18) — our house brand's omega, the value pick per capsule

Visit us in-store:

• Centurion (Flagship): 117 Galway Ave, Hennopspark, Centurion, 0157 — 071 374 4910
• Glen Village (Pretoria East): Glen Village Center South, Cnr Solomon Mahlangu Dr & Olympus Dr, Faerie Glen, Pretoria, 0081 — 066 022 7457
• Edenvale (Johannesburg): Shop 7, Green Valley Shopping Centre, Stoneridge Dr, Greenstone Hill, JHB 1609 — 077 356 0173

Free delivery is available nationwide on orders over R400.

Frequently asked questions

Is fish oil the same as omega-3?

Fish oil is one source of omega-3, specifically EPA and DHA. Omega-3 as a category also includes ALA from plant sources and algae-derived EPA/DHA for those who don't want a fish-based product.

How do I know if my fish oil has gone off?

A strongly rancid or "off" smell, rather than a normal mild fishy scent, is the main sign. Keep capsules in a cool, dark place, and in the fridge once opened, to slow this down.

Can I take omega-3 with other supplements?

In most cases yes, but check for overlap if you're taking multiple products, and speak to a pharmacist or doctor if you're on chronic medication, especially blood thinners.

Do I need a very high dose?

Not necessarily. Match the serving to the label of the specific product you've chosen, and stay consistent rather than chasing the highest number on the shelf.

Is algae oil as effective as fish oil?

Algae oil provides EPA and DHA directly, since it's the original source fish get theirs from, making it a solid option for vegetarians, vegans, or anyone who prefers a plant-based product.

More wellness resources from One Life Health

• Best Probiotics in South Africa (2026 Guide)
• NAD+ & NMN Supplements in South Africa: The Complete Guide (2026)
• Lion's Mane Mushroom: Benefits & Best Supplements in South Africa (2026)
• Browse all supplements

From the apothecary shelf

Three products we'd hand a customer asking for a starting point. Not a paid placement — these are what we actually take, recommend, or keep at the front of the shelf.