A pescatarian diet includes fish and seafood but excludes other types of meat, such as beef, pork, and poultry. Some pescatarians also eat eggs and dairy products, while others follow a diet that is almost entirely plant-based aside from the addition of seafood.
Because fish provides protein, vitamin B12, omega-3 fatty acids, and several minerals that can be harder to obtain from a strictly vegetarian or vegan diet, pescatarians do not automatically need to take supplements. However, simply eating fish occasionally does not guarantee that every nutritional need is being met.
The nutrients you receive from a pescatarian diet will depend on the types of seafood you eat, how frequently you eat it, whether you consume eggs and dairy, and what the rest of your diet looks like. Someone who regularly eats salmon, sardines, eggs, Greek yogurt, vegetables, beans, and whole grains will have a very different nutritional intake from someone who mostly eats pasta, meatless frozen foods, and an occasional tuna sandwich.
Before buying supplements, it is worth looking at the foods you eat and determining whether there are meaningful gaps. Blood testing may also be appropriate when a deficiency is suspected, particularly for nutrients such as iron, vitamin B12, and vitamin D.
Below, we’ll look at eight nutrients pescatarians should consider, which foods provide them, and the circumstances in which a supplement be beneficial.
Medical disclaimer: This article is provided for general informational purposes and is not a substitute for individualized medical advice. Speak with a physician or registered dietitian before beginning a new supplement, especially if you are pregnant, have a medical condition, take prescription medication, or believe you may have a nutritional deficiency.
Quick Answer: Do Pescatarians Need to Take Supplements?
Most pescatarians do not need to take every supplement on this list. Fish and seafood naturally provide several nutrients that vegetarians and vegans may have more difficulty obtaining, including vitamin B12, zinc, iodine, selenium, and the omega-3 fatty acids EPA and DHA.
However, pescatarians can still fall short on certain nutrients depending on their food choices. Vitamin D, iron, calcium, iodine, vitamin B12, zinc, omega-3s, and protein are all worth considering when evaluating a pescatarian diet.
The goal should generally be to obtain nutrients from food first and use supplements to address an actual or likely gap, not to take a large collection of pills advertised on podcasts.
Nutrients Pescatarians May Need to Consider
| Nutrient | Pescatarian Food Sources | When a Supplement May Be Worth Considering |
|---|---|---|
| Vitamin B12 | Fish, shellfish, eggs, dairy, fortified foods | If seafood, eggs, and dairy are eaten infrequently or absorption is impaired |
| Vitamin D | Fatty fish, egg yolks, fortified milk and plant milks | If blood levels are low or dietary and sun exposure are limited |
| Iron | Shellfish, legumes, tofu, seeds, leafy greens, fortified foods | If testing confirms low iron or iron-deficiency anemia |
| Omega-3 fatty acids | Salmon, sardines, mackerel, herring, trout | If fatty fish is rarely eaten |
| Iodine | Cod, tuna, shrimp, dairy, eggs, iodized salt, seaweed | If seafood, dairy, eggs, and iodized salt are limited |
| Calcium | Dairy, fortified plant milk, tofu, sardines, canned salmon, greens | If dairy and fortified alternatives are avoided |
| Zinc | Oysters, crab, fish, dairy, eggs, beans, nuts, seeds | If seafood and other zinc-rich foods are limited |
| Protein | Fish, shellfish, eggs, dairy, tofu, tempeh, legumes | If appetite, convenience, or a restrictive diet makes protein targets difficult |
1. Vitamin B12
Vitamin B12 helps support healthy blood and nerve cells and is involved in DNA production. It is naturally found in animal-derived foods, including fish, shellfish, eggs, and dairy products. Plant foods do not naturally contain meaningful amounts of vitamin B12 unless they have been fortified.
For this reason, vitamin B12 is commonly discussed in connection with vegetarian and vegan diets. Pescatarians generally have an easier time obtaining it because many types of seafood contain substantial amounts. Clams are particularly rich in vitamin B12, while salmon, tuna, sardines, and trout also contribute meaningful amounts. Eggs and dairy products provide additional B12 for pescatarians who include them.
Someone who regularly eats fish or shellfish may already consume enough vitamin B12 without supplementation. However, intake deserves more attention if seafood is eaten only occasionally, eggs and dairy are excluded, or the diet is otherwise predominantly vegan. Certain medical conditions and medications can also interfere with B12 absorption, and older adults may have more difficulty absorbing the vitamin from food.
Vitamin B12 deficiency can cause neurological problems as well as megaloblastic anemia, so it is not something to diagnose based only on whether you feel tired. Fatigue also has a myriad of causes, so a blood test can provide more useful information than guessing.
2. Vitamin D
If your clinician recommends a simple vitamin D supplement, Thorne Vitamin D-1000 is one straightforward option to compare against your recommended dosage.
Vitamin D supports calcium absorption, bone health, muscle function, nerve signaling, and normal immune function. The body can produce it in response to sunlight, but the amount produced depends on factors such as season, location, skin pigmentation, age, sunscreen use, and how much time someone actually spends outdoors.
Relatively few foods naturally contain large quantities of vitamin D. Fatty fish are among the best sources, which gives pescatarians an advantage over people following completely vegetarian or vegan diets. Salmon, trout, mackerel, and certain other fatty fish contain vitamin D, while egg yolks provide smaller amounts. Milk and many plant-based milk alternatives are fortified, although the amount varies and should be checked on the nutrition label.
Even so, eating fish does not make a person immune to low vitamin D levels. Someone who rarely eats fatty fish, consumes few fortified foods, or has limited sun exposure may still fall short.
Be aware that vitamin D is fat-soluble, which means the body can store it, and excessive supplemental intake can cause harmful effects. This is not an area where more automatically means better, and consulting a medical professional for guidance is ideal.
3. Iron
If testing shows that you do need iron, a product like Thorne Iron Bisglycinate may be worth discussing with your provider. This is not one I would add casually without labs.
Iron is needed to produce hemoglobin, the protein in red blood cells that transports oxygen throughout the body. It also contributes to growth, development, hormone production, and normal cellular function.
There are two major forms of dietary iron. Heme iron comes from animal foods and is generally absorbed more efficiently, while nonheme iron is found in plant foods and fortified products. Pescatarians do not consume the heme iron found in red meat or poultry, but some types of seafood provide it. Oysters, clams, mussels, sardines, and tuna can all contribute iron.
Plant-based sources include lentils, beans, tofu, pumpkin seeds, spinach, quinoa, and fortified cereals. Eating vitamin C-rich foods with these sources can improve the absorption of nonheme iron. A meal containing lentils, peppers, tomatoes, or citrus fruit, for example, may be more useful than examining each food in isolation.
Iron is one supplement that should not be taken simply because a diet might be imperfect. High-dose iron can cause constipation, nausea, abdominal pain, and other gastrointestinal problems, and unnecessary supplementation can be harmful. It may also interfere with the absorption of other minerals.
Testing is especially important for people who menstruate heavily, are pregnant, donate blood frequently, or have gastrointestinal conditions that affect absorption. If you are experiencing unexplained fatigue, weakness, shortness of breath, or other concerning symptoms, seek medical advice rather than self-prescribing iron based on a symptom list you found online.
4. Omega-3 Fatty Acids
If you rarely eat salmon, sardines, herring, mackerel, or trout, Nordic Naturals Ultimate Omega is one fish-oil option to compare. If avoiding land-animal gelatin matters to you, Nordic also makes an Ultimate Omega version with fish gelatin.
Omega-3 fatty acids are involved in cell membrane function and numerous processes throughout the body. The three major types discussed in nutrition are alpha-linolenic acid, or ALA; eicosapentaenoic acid, or EPA; and docosahexaenoic acid, or DHA.
ALA is found primarily in plant foods such as flaxseed, chia seeds, walnuts, and certain vegetable oils. EPA and DHA are found mainly in fish and seafood. The body can convert a small amount of ALA into EPA and DHA, but the conversion is limited, which is why fatty fish receives so much attention in discussions about omega-3 intake.
Salmon, sardines, herring, mackerel, and trout are among the best pescatarian sources. A person who eats these foods regularly may have little reason to add fish-oil capsules on top of them.
The more useful question is not simply whether you eat fish, but which fish you eat and how often you eat it. Someone who has salmon twice per week is in a different nutritional position from someone who identifies as pescatarian but eats shrimp once a month and otherwise survives on cheese quesadillas.
People who rarely eat fatty fish may consider fish oil or an algae-derived EPA and DHA supplement. When comparing products, check the listed amounts of EPA and DHA rather than looking only at the total milligrams of fish oil. A capsule may advertise a large quantity of fish oil while providing a much smaller amount of the specific omega-3 fatty acids you are trying to obtain.
5. Iodine
Iodine is required for the production of thyroid hormones, which help regulate metabolism and support normal growth and development.
Fish and seafood are generally good sources. Cod, tuna, shrimp, and seaweed can all provide iodine, while dairy products, eggs, and iodized salt contribute additional amounts. Pescatarians may therefore have an easier time obtaining iodine than vegans, particularly if they regularly eat seafood or dairy.
However, iodine intake can be difficult to estimate because the amount in food varies. It is also important to understand that not every type of salt contains iodine. Sea salt, kosher salt, Himalayan salt, and other specialty salts are often not iodized. Processed foods also usually contain noniodized salt, which means eating a salty diet does not necessarily mean you are consuming much iodine.
A pescatarian who rarely eats seafood, avoids dairy and eggs, and exclusively uses noniodized salt has more reason to examine iodine intake. That does not mean reaching immediately for a concentrated kelp supplement. Seaweed and kelp products can contain highly variable amounts of iodine, and excessive intake can create thyroid problems.
Something being harvested from the ocean and packaged in a bottle with a tasteful green label does not make unlimited quantities harmless. People with thyroid conditions should be especially cautious and discuss supplementation with a healthcare provider.
6. Calcium
Calcium is best known for its role in bone and tooth health, but it is also involved in muscle contraction, nerve transmission, blood vessel function, and hormone secretion.
Pescatarians who consume dairy products can obtain calcium from milk, yogurt, cheese, and cottage cheese. Fortified plant milks and calcium-set tofu are useful options for people who avoid dairy. Certain types of seafood also contribute meaningful amounts, particularly canned sardines and canned salmon when the softened bones are eaten.
Leafy greens such as kale and bok choy contain calcium as well, although absorption varies among different plant foods. Spinach, for example, contains calcium but also contains compounds that significantly reduce how much of it the body absorbs. The amount printed in a nutrient database does not always tell the full story.
People who regularly eat dairy or calcium-fortified alternatives may already meet their needs without a supplement. Intake is more likely to be low when someone avoids dairy, does not use fortified plant milk, and rarely eats tofu or canned fish with edible bones.
Before buying a calcium supplement, estimate how much you obtain from food. Adding a serving of yogurt, fortified plant milk, tofu, sardines, or canned salmon may fill the gap without creating another bottle that lives permanently in the cabinet after being taken three times.
Calcium supplements can also interact with certain medications and interfere with the absorption of other minerals, so dosage and timing may matter when supplementation is necessary.
7. Zinc
If you and your provider decide a targeted zinc supplement makes sense, Thorne Zinc Bisglycinate is one simple option to compare with your total zinc intake from food and other supplements.
Oysters contain more zinc per serving than any other commonly consumed food, making them something of an absurd nutritional overachiever. Other pescatarian sources include crab, lobster, fish, eggs, and dairy products. Beans, nuts, seeds, and whole grains also contain zinc, although zinc from plant foods may be absorbed less efficiently because of compounds called phytates.
Because pescatarians can eat shellfish, zinc is not necessarily as much of a concern as it can be on a vegan diet. Someone who regularly consumes seafood, eggs, dairy, beans, nuts, and seeds may already obtain an adequate amount.
A supplement may be worth discussing when the diet is unusually restrictive or contains few reliable sources. However, high supplemental zinc intake can interfere with copper absorption and cause additional adverse effects.
Zinc is also frequently added to multivitamins, lozenges, immune-support formulas, and other products, so check all labels before combining them. Accidentally creating a homemade mineral megadose is not the sort of meal prep this site recommends.
8. Protein
If convenience is the issue, Klean Athlete Klean Isolate Unflavored and Klean Athlete Klean Isolate Vanilla are whey protein options for pescatarians who include dairy. Perfect Keto also produces a Keto Whey Protein product that incorporates MCT oil powder, making it ideal for a pescatarian keto diet.
Protein is not a vitamin or mineral, but it is still one of the most common nutritional concerns among people reducing or eliminating meat.
Most pescatarians can obtain enough protein without a supplement. Fish, shellfish, eggs, Greek yogurt, cottage cheese, tofu, tempeh, lentils, beans, and certain higher-protein grains can all contribute. Seafood is especially useful because it provides a substantial amount of complete protein without requiring every meal to be constructed around increasingly ambitious piles of lentils.
Protein intake can become more challenging for someone who has a low appetite, is highly active, avoids eggs and dairy, eats fish only occasionally, or follows a calorie-restricted diet. Convenience also matters. A perfectly adequate protein source is not particularly useful if it requires preparation someone consistently does not have the time or energy to do.
Protein powder can help in these situations, but it is a convenience product rather than a requirement for following a pescatarian diet. Whey and casein powders are suitable for pescatarians who consume dairy, while egg-white, soy, pea, rice, and blended plant proteins offer additional options.
Marine collagen is technically pescatarian, but collagen powder should not generally be treated as a complete replacement for a conventional protein powder. It has a different amino acid profile and does not provide the same complete protein source as fish, eggs, dairy, soy, or a thoughtfully formulated plant-based blend.
Protein powder can be added to smoothies, yogurt, oatmeal, or quick meals when it solves an actual problem. There is no nutritional prize awarded for drinking your lunch when you would rather eat actual food.
Nutrients Pescatarians Often Get From Seafood
It is easy for supplement content to become a catalog of everything that could theoretically go wrong. However, pescatarians may obtain several nutrients more easily than vegetarians or vegans because seafood is nutritionally dense.
Depending on the types eaten, seafood can provide:
- Vitamin B12
- EPA and DHA omega-3 fatty acids
- Iodine
- Zinc
- Selenium
- Iron
- Vitamin D
- High-quality protein
This does not mean every seafood option provides every nutrient in the same amount. Salmon is useful for omega-3s and vitamin D, oysters are unusually high in zinc, clams provide vitamin B12 and iron, and canned sardines with bones contribute calcium.
Eating a variety of seafood is therefore more nutritionally useful than relying exclusively on one convenient option. Tuna may be easy to keep in the pantry, but it does not single-handedly fulfill every possible responsibility of the ocean.
How to Decide Whether a Supplement Is Worth Taking
If you are trying to build the food side first, start with my pescatarian keto food shopping list, 7-day pescatarian keto meal plan, and low-carb pescatarian meal ideas. Note that my resources are geared toward a low carb or ketogenic diet, but any pescatarian can try them with modifications like lowering the fat content and adding potatoes or rice for a carb source.
Before adding a supplement, start with evaluating what you actually eat.
Do not assess an imaginary pescatarian diet assembled from flawless Mediterranean meals featuring grilled salmon, fresh vegetables, lentils, and hand-harvested herbs. Look at the meals you have consumed over the past several weeks. How often do you eat fatty fish, shellfish, eggs, dairy or fortified alternatives, beans, nuts, seeds, leafy greens, and other nutrient-dense foods?
The label “pescatarian” describes what you exclude but does not guarantee the nutritional quality of everything you include. If you’re approaching the diet from an ethical perspective rather than a health perspective, you may find you have a few nutritional gaps, just as vegans and vegetarians can eat unhealthy diets.
Identify the Real Dietary Gap
A supplement makes the most sense when a nutrient is consistently difficult to obtain through the foods you eat. Someone who avoids dairy and never drinks fortified plant milk may need to pay closer attention to calcium, but someone who eats salmon and sardines several times per week has less reason to buy an omega-3 supplement.
Food preferences, allergies, budget, appetite, cooking habits, and medical conditions all affect what is realistic. Telling someone to “just get everything from food” is not especially useful when the foods containing a nutrient are ones they cannot or will not consistently eat.
Use Testing When It Can Provide an Answer
Blood tests can help assess iron status, vitamin B12 levels, vitamin D status, and certain other nutritional concerns. Testing is particularly helpful when symptoms are present, a person belongs to a higher-risk group, or taking an unnecessary supplement could be harmful.
Not every nutritional question can be solved through a standard blood test, but when testing is available, it is generally more informative than selecting supplements based on a collection of vague symptoms that could describe almost anyone.
Check for Overlapping Ingredients
Review multivitamins, fortified protein powders, electrolyte products, greens powders, and any other supplements you already use. Ingredients can overlap, and it is surprisingly easy to consume far more of a nutrient than intended when every product wants to become a comprehensive wellness ecosystem.
How to Choose Supplements for a Pescatarian DIet
When a supplement is appropriate, look beyond the branding and front-label claims. The supplement industry is very good at covering a bottle with leaves, waves, mountains, and scientific-looking words without making the useful information particularly easy to find.
Consider:
- The amount of the active nutrient per serving
- Whether the dosage matches your actual needs
- The number of capsules required per serving
- Added sugars, sweeteners, and unnecessary ingredients
- Potential allergens
- Interactions with medications
- Whether the product has been independently tested
- Whether the manufacturer clearly identifies ingredient quantities
For fish-oil supplements, check the amounts of EPA and DHA rather than relying on the total quantity of fish oil. For multivitamins, compare each nutrient against the Daily Value rather than assuming that percentages in the hundreds or thousands are automatically advantageous.
Supplements contain biologically active ingredients. They should not be treated as harmless lifestyle accessories simply because they are sold without a prescription.
Can Pescatarians Take Regular Vitamins?
Most standard vitamins and mineral supplements are compatible with a pescatarian diet, but the capsule or other inactive ingredients may not be.
Gelatin capsules are typically made from animal collagen and may come from cows or pigs. Pescatarians who avoid all land-animal ingredients can look for products using:
- Vegetable cellulose capsules
- Hypromellose capsules
- Fish gelatin
- Liquid, powder, gummy, or tablet formats without mammalian gelatin
Product formulations can change, so check the current ingredient label rather than relying entirely on a product name or an old online review.
Should Pescatarians Take a Multivitamin?
If you want a general multivitamin to compare labels against, Thorne Basic Nutrients 2/Day is one option, but the right fit depends on what you actually need and whether you want iron included.
A multivitamin can provide nutritional insurance for someone whose diet is inconsistent, restrictive, or lacking in fortified foods. However, it is not automatically necessary for every pescatarian.
A multivitamin also does not compensate for a diet low in protein, fiber, vegetables, or essential fats. Pills can supply individual micronutrients, but they do not recreate the complete nutritional value of fish, vegetables, legumes, fruit, nuts, seeds, and other whole foods.
If you choose a multivitamin, look for one that addresses your actual needs without supplying excessive amounts of nutrients you already consume. Someone with normal iron levels, for example, may prefer an iron-free multivitamin. Someone with a diagnosed iron deficiency should follow individualized guidance rather than assuming that the small amount in a general multivitamin will be sufficient.
Frequently Asked Questions About Pescatarian Supplements
Do pescatarians need vitamin B12?
Pescatarians can obtain vitamin B12 from fish, shellfish, eggs, and dairy products. Those who eat these foods regularly may not need a supplement, while people who consume them infrequently or have difficulty absorbing B12 may benefit from testing and supplementation.
Do pescatarians need fish-oil supplements?
Pescatarians who regularly eat fatty fish such as salmon, sardines, mackerel, herring, or trout may already obtain substantial amounts of EPA and DHA. People who rarely eat fatty fish may consider fish oil or an algae-based omega-3 supplement.
Can pescatarians become iron deficient?
Yes. Pescatarians can develop iron deficiency, particularly if they menstruate, are pregnant, donate blood frequently, have absorption problems, or consume few iron-rich foods. Iron supplements should generally be guided by blood testing and professional advice.
Do pescatarians need iodine?
Fish, shellfish, dairy products, eggs, seaweed, and iodized salt can provide iodine. Someone who regularly eats these foods may obtain enough, while a person who limits them and uses only noniodized salt may need to evaluate their intake.
What is the best multivitamin for pescatarians?
The best multivitamin depends on the person’s diet, age, medical history, medications, and confirmed nutritional needs. Look for transparent labeling, appropriate dosages, and a capsule or tablet that does not contain land-animal gelatin if that is important to you.
Is collagen pescatarian?
Marine collagen made from fish is generally considered pescatarian. Bovine and porcine collagen are made from cows and pigs and are not compatible with a pescatarian diet.
Do pescatarians need protein powder?
Most pescatarians can meet their protein needs through fish, shellfish, eggs, dairy, soy foods, beans, lentils, nuts, and seeds. Protein powder may be useful for convenience, a low appetite, higher protein targets, or a diet that limits several of these foods.
Build the Diet First, Then Fill the Gaps
Pescatarians do not automatically need supplements. A varied diet that includes fish, shellfish, eggs or dairy if desired, legumes, vegetables, nuts, seeds, and fortified foods can provide a broad range of essential nutrients. However, the word “pescatarian” covers many different eating patterns, not all of which are optimal.
Vitamin B12, vitamin D, iron, omega-3 fatty acids, iodine, calcium, zinc, and protein are all worth reviewing. In many cases, the answer will be to eat a wider variety of nutrient-dense foods. In others, blood testing and a targeted supplement may be appropriate. After all, the most useful supplement routine is one that addresses your actual diet and health needs without wasting money or producing extremely expensive urine.
What supplements do you take on a pescatarian diet? Are there any high-quality brands you’d recommend? Please feel free to share in the comments!