Does Fish Oil Make You Taller?

Fish oil is one of the most popular supplements in American households — and at some point, a rumor attached itself to it: that omega-3s might help kids grow taller. Parents started adding it to their children’s routines alongside multivitamins and calcium gummies. Teenagers started Googling it. The question does fish oil make you taller now gets searched thousands of times a month.

The short answer is no — fish oil does not make you taller. No clinical evidence shows that omega-3 supplementation increases height in children or adults. Fish oil supports bone health, brain development, and inflammation control, but these benefits don’t translate to measurable gains in height. Height is roughly 80% genetic, with nutrition, sleep, and activity filling in the remaining 20%.

That said, the relationship between omega-3s and healthy development is more interesting than a flat “no” suggests. Here’s what the research actually shows.

Key Takeaways

• Fish oil has not been shown in clinical trials to increase height in children or adults.
• Genetics account for approximately 80% of your final height, according to Silventoinen (2003).
• Omega-3 fatty acids support bone density, joint health, and brain development — all valuable, none of them height-increasing.
• Once growth plates close at the end of puberty, no supplement can increase adult height.
• If you want to support healthy growth during childhood, focus on sleep, protein, and overall diet quality — not a single supplement.

What Is Fish Oil and How Does It Work?

Fish oil comes from the tissues of oily fish — salmon, sardines, mackerel, anchovies. Its main active compounds are two omega-3 fatty acids: EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid).

These are essential fats, meaning your body can’t make them in meaningful quantities on its own. They integrate into cell membranes throughout the body, support cardiovascular function, reduce inflammatory signaling, and play a significant role in brain development. The American Heart Association recommends eating fish at least twice per week as a dietary source.

In supplement form, fish oil is usually sold as softgels or liquid. Quality varies considerably, which matters — more on that later.

What fish oil does not do is act on growth hormone, stimulate growth plate activity, or extend the window during which bones lengthen. Those processes have their own hormonal drivers.

Can Fish Oil Actually Make You Taller?

What Research Says

No randomized controlled trial has shown that fish oil supplementation increases height. That’s the honest summary of the evidence. Studies on omega-3s and growth tend to focus on bone mineral density, body composition, and inflammatory markers — not linear growth.

There’s a meaningful difference between “supports healthy development” and “increases height.” Fish oil may fit the first description. It does not fit the second, based on current peer-reviewed research.

Some observational data links better overall nutrition — including adequate essential fatty acid intake — to children reaching closer to their genetic height potential. But that’s a far cry from fish oil capsules making a teenager two inches taller. Correlation between “eats well” and “grows well” isn’t a sales pitch for any single supplement.

The Short Answer

Fish oil supports the conditions healthy growth needs. It does not drive growth itself.

Think of it this way: a well-oiled engine runs better than a neglected one, but engine oil doesn’t make the car go faster by itself. The fuel, the design, and the driver still determine the outcome. For height, genetics are the design. Sleep, protein and height growth, and adequate vitamins for height growth are the fuel. Fish oil, if it does anything for growth, is closer to one part of routine maintenance.

What Actually Determines Your Height?

Genetics Plays the Biggest Role

Height is a polygenic trait — meaning hundreds of genes influence it simultaneously. A landmark 2022 study published in Nature identified over 12,000 genetic variants associated with height across 5.4 million participants, explaining roughly 40% of height variation in people of European ancestry (Yengo et al., 2022).

The broader estimate — that genetics explain about 80% of final height in developed countries — comes from decades of twin and family studies (Silventoinen, 2003). In populations with adequate nutrition, that figure holds fairly consistently. The practical implication: no supplement, diet, or exercise routine will overcome what your DNA has largely predetermined. It can, however, help you reach the top of your genetic range rather than the bottom.

Nutrition During Childhood and Adolescence

The remaining ~20% of height variation is where environment matters most — and nutrition leads that category.

Protein is the most underappreciated growth nutrient. Bones, muscle, and connective tissue all require it. Calcium and vitamin D support bone mineralization directly. Zinc deficiency has been linked to growth stunting in children. A 2021 study in Nutrients found that diet quality is meaningfully associated with height-for-age in US children, with soft drink consumption and high-fat diets linked to lower scores (Kim & Keen, 2021).

The foods that help you grow taller aren’t exotic or expensive. Eggs, lean meats, dairy, leafy greens, and legumes cover most of what a growing body needs. A well-rounded diet outperforms any single supplement, every time.

How Omega-3 Supports Bone and Overall Growth

Here’s where fish oil earns its place — just not the place the supplement labels imply.

Omega-3 fatty acids contribute to bone health through several pathways. DHA is a structural component of cell membranes in bone-forming cells (osteoblasts). EPA has anti-inflammatory properties that may reduce bone resorption — the process by which bone breaks down. A 2025 meta-analysis in Frontiers in Pediatrics found that exercise interventions significantly improved bone mineral density in adolescents aged 10–19 (Front Pediatr., 2025), and omega-3s may complement that effect by supporting the mineral absorption environment.

DHA is also the dominant fatty acid in the brain — and growth isn’t purely skeletal. Brain development, hormone signaling, and immune function all run in parallel with physical growth during childhood. Adequate DHA intake during early development is associated with better cognitive outcomes, and the years of peak linear growth overlap heavily with years of rapid brain development.

The contrarian point most articles miss: fish oil’s strongest case for supporting growth isn’t about bones at all — it’s about sleep. Omega-3 deficiency has been linked to disrupted sleep patterns in children, and sleep is when the body does the majority of its growing. Growth hormone is primarily secreted during slow-wave (deep) sleep — not a background trickle, but significant pulses concentrated in the first hours after falling asleep (Shaw et al., 2023). If inadequate omega-3 intake is compromising sleep quality, fixing that gap could theoretically help children sleep more deeply and, by extension, release more growth hormone. That’s speculative for fish oil specifically, but the mechanism is real.

Can Adults Grow Taller With Fish Oil?

Understanding Growth Plates

No. Adults cannot increase height naturally after their growth plates close — and no supplement changes that.

Growth plates (epiphyseal plates) are layers of cartilage near the ends of long bones. During childhood and adolescence, new cartilage is continuously produced at these plates and then hardened into bone, pushing the bone longer. At the end of puberty, the plates fuse and ossify. Once that happens, longitudinal bone growth stops.

For most girls, growth plates close between ages 13–15. For most boys, closure typically happens between 15–17, though some continue growing into their late teens. The signs you’ve stopped growing are measurable — X-rays can confirm plate closure definitively.

Fish oil cannot reopen fused growth plates. Neither can any other supplement, hormone therapy (outside of medical intervention), or exercise protocol.

What Fish Oil Can Still Do for Adults

The list is genuinely useful, just unrelated to height.

Omega-3s remain valuable for adults for cardiovascular health, joint mobility, cognitive function, and exercise recovery. EPA’s anti-inflammatory effects can reduce joint pain, which matters for active adults and athletes. DHA continues supporting brain health throughout life. These are real benefits — they’re just not the ones that get marketed on height forums.

Best Ways to Support Healthy Growth Naturally

If you’re a parent trying to help your child reach their full height potential, fish oil is far from the first place to focus. The 9 science-backed tips to grow taller follow a familiar pattern — the same advice that applies to general childhood health applies to height growth. That’s not a coincidence.

Sleep is the most underutilized lever. Most teenagers get 6–7 hours on school nights. The CDC recommends 8–10 hours for adolescents. That gap has direct consequences: growth hormone pulses are concentrated during deep sleep, and chronic sleep restriction compresses those pulses significantly (Frontiers in Endocrinology, 2023). No supplement compensates for chronic sleep debt.

Protein intake matters more than most parents realize. Aim for adequate daily protein from whole food sources — eggs, chicken, fish, legumes, dairy. Dairy in particular has a meaningful track record: a prospective cohort study following 5,101 US girls found that those drinking more than three servings of dairy per day had measurably greater height growth (Wiley, 2005).

Physical activity, particularly weight-bearing exercise and sports, promotes bone density and supports healthy skeletal development. Questions like does basketball make you taller often confuse correlation for causation — tall kids play basketball, not the other way around — but the general principle that active kids develop stronger bones is well-supported (Reza Nouri et al., 2010).

If you’re concerned about a child’s growth trajectory, a pediatrician can plot height against CDC growth charts and flag anything worth monitoring. That’s a better use of time than optimizing supplement stacks.

Choosing a Quality Fish Oil Supplement in the United States

If you’ve decided to add fish oil to a child’s or teenager’s routine for its general health benefits, the quality gap between products is large enough to matter.

Brands like Nordic Naturals and Nature Made have established third-party testing records in the US market. ConsumerLab publishes independent test results for dozens of omega-3 products if you want to verify a specific brand before buying.

One practical note: fish oil capsules for children are available in flavored or chewable forms. The compliance difference between a gummy that tastes like strawberry and a regular softgel is real — a supplement that sits in the cabinet doesn’t help anyone.

Orianna Lux, MS, RDN Medically Reviewed by Expert

Registered Dietitian Nutritionist | Pediatric Growth & Nutrition Specialist

Orianna is a Registered Dietitian Nutritionist with a Master's degree in Human Nutrition and over 8 years of clinical experience specializing in pediatric growth, childhood nutrition, and height development.

MS in Human Nutrition Registered Dietitian Nutritionist (RDN) Pediatric Nutrition Specialist 8+ Years Clinical Experience Evidence-Based Practice

Last updated: July 14, 2026