Mirjam Henzen Walk into any health food store and the supplement aisle is longer than you’d expect. There’s a bottle for everything — energy, focus, sleep, immunity, skin, gut health, stress. Most people standing in that aisle, or scrolling through an online shop, feel the same thing: quietly overwhelmed, not entirely sure what they actually need.
The question do I need supplements gets asked millions of times a year. And almost every answer is written by someone with something to sell.
This one isn’t.
The short version to the question, “Do I need supplements?”: most people don’t. Not because supplements are useless — but because most people are reaching for them before they understand what’s actually going on.
What a Supplement Actually Is (And What It Is Not)
When you eat a handful of spinach, you’re not just eating magnesium. You’re eating magnesium alongside the other compounds that help your body recognize it, transport it, and put it to work. Vitamin C. Chlorophyll. Enzymes. Amino acids. They don’t sit separately in the leaf — they come as a complete, interconnected system that nature spent a long time getting right.
A magnesium supplement is magnesium pulled out of that system. Isolated, concentrated, and put in a capsule. Your body receives one instruction without the rest of the team that makes it possible to follow.
This is why comparing food and supplements isn’t really about nutrients at all. It’s about context. Nature delivers nutrients in relationship — always. A supplement delivers them alone.
And here’s what often gets left out of the conversation: nutrients work together in ways that matter. Vitamin C helps your body absorb iron. Magnesium activates vitamin D. Vitamin K2 directs calcium where it belongs — toward your bones, not your arteries. When you pull one compound out of its natural setting and send a large dose of it in alone, you don’t just add something. You shift the balance of everything around it.
What a real magnesium gap actually looks like in the body — and what whole foods do that a capsule can’t — is covered in 6 Signs of Low Magnesium — and the Raw Foods That Fix It Every Day.
Why Isolates Can Leave You More Deficient, Not Less
This is the part the $177 billion supplement industry would rather you didn’t sit with too long.
When your body receives a high-dose isolated nutrient consistently, it adjusts. It may slow down its own pathways, recalibrate around what it’s being given rather than what it was designed to do on its own. And other nutrients — the ones that were already a little thin — can get pushed further out of balance in the process.
You improve one thing and quietly create two new gaps you haven’t thought to check.
Supplements, at their best, are a bandage. Useful in the right moment, for the right person, with the right reason behind them. But a bandage doesn’t close the wound. It covers it. The underlying cause — why your levels dropped in the first place — is still there, still running.
If you want to understand what might actually be blocking absorption in the first place, this is explored in Why Your Body Isn’t Absorbing Nutrients Properly (And How to Fix It Naturally).
Are Most People Supplementing Without Actually Knowing They Need To?
Yes. And it’s worth naming honestly.
The supplement market is enormous, and a significant part of it is people buying products because a friend mentioned them, a podcast recommended them, or they felt off for a few weeks and someone suggested B12. Not because a blood panel confirmed a real deficiency.
“Within normal range” on a standard test, by the way, is not the same as nourished. Normal ranges are designed to flag clinical deficiency — not to tell you whether you’re running well. You can sit at the bottom of normal and feel consistently flat, foggy, and tired. Technically fine. Not actually well.
This is why testing before spending matters. Know what’s genuinely low, and — more importantly — why. Spend the money on answers, not guesses.
Do I Need Supplements at All? Here’s When It Actually Makes Sense
There are absolutely situations where supplementing is the right call.
If testing shows your levels are severely depleted — not just on the low side, but genuinely running on empty — a supplement can be a meaningful bridge. Not because it fixes the problem, but because someone running that low often doesn’t have the energy to do the deeper work. A temporary supplement can bring things back into a range where you feel like yourself again. And feeling like yourself is what gives you the capacity to actually look at what caused the deficiency in the first place.
The word that matters here is simultaneously. Use the supplement as a bridge. Use that same window to work on the cause. Because a depleted level is always downstream of something — a compromised gut lining, chronic stress draining your mineral reserves, absorption that’s been struggling for reasons that haven’t been investigated yet.
A deficiency doesn’t come out of nowhere. It has a story. And if that story isn’t addressed alongside the supplement, you’ll likely need to keep supplementing indefinitely. The drain is still running. The supplement is just keeping pace with it.
If you’ve been eating well and still feel like something’s off, Eating Healthy but Still Tired? Here’s What Your Digestion Is Missing is a good place to start.
The people I work with who rebuild their gut health, their digestion, their absorption — the change goes far beyond any blood test result. They sleep better. Their skin shifts. Brain fog that had quietly become their normal simply lifts. When the body is genuinely receiving what it needs, it shows up everywhere. Not because they found the right supplement. Because they fixed what was getting in the way.
Is B12 Deficiency Really a Plant-Based Problem?
B12 is one of the most talked-about nutrients in plant-based communities, and one of the most misunderstood.
Here’s what often gets left out: B12 is not made by plants. It’s not made by animals either. It is produced by bacteria and other microorganisms — making it genuinely unique among the nutrients we call vitamins. Every source of B12 in food ultimately traces back to bacterial production. B12 is, technically, a microbial product, not a vitamin. That matters for how you think about getting it.
Your gut does produce B12. That’s not in dispute. The question is whether it’s produced far enough up in the digestive tract to be fully absorbed from there — and that’s an absorption question, not a production question.
In the pre-modern world, B12 came partly from soil bacteria on produce that hadn’t been scrubbed clean. Soil was alive with microbial activity. Modern industrial farming, heavy pesticide use, and thorough food washing have changed that picture in ways that are hard to fully measure — but real.
Now here’s the part that rarely makes headlines: B12 deficiency is not a plant-based problem. It is a widespread human problem. Research consistently shows significant deficiency rates across all dietary groups — including people who eat meat regularly. The Framingham Offspring Study found that nearly 40% of adults in the general population had low or borderline B12 levels. The majority of them were not vegan or vegetarian.
The narrative that B12 is something plant-based eaters need to worry about — while everyone else is covered — is simply not supported by the data. It is, however, very convenient for industries that benefit from that story staying in circulation. The harder question — why gut health, absorption capacity, and soil depletion are not the center of this conversation — almost never gets asked.
What is certain: if your digestion is struggling, B12 is unlikely to be the only nutrient affected. Poor gut health affects absorption across the board. B12 is just one of the first things people notice — through brain fog, low energy, or a flat, heavy feeling that’s hard to pin down.
That connection between gut health and brain fog is explored in How to Clear Brain Fog Naturally: Why It Starts in Your Gut.
If You Do Supplement B12, This Is What to Look For
B12 sits in a different category from most other supplements — and it’s worth understanding why.
When you take a magnesium supplement, you’re taking one mineral in isolation — separated from chlorophyll, enzymes, and companion minerals that nature designed to deliver alongside. The isolation is the problem. B12 doesn’t work that way. It isn’t packaged inside plant food to begin with — it comes from bacterial activity, not from the food matrix itself. Which means the “isolate” criticism that applies to most supplements simply doesn’t apply here in the same way.
When it comes to B12 specifically, the conversation is different. Whether you’re addressing a confirmed deficiency, making sure you’re consistently covered, or simply finding a rhythm that feels right for you — daily, a few times a week, whatever works — supplementing B12 is a different conversation than reaching for a magnesium pill.
If you are going to supplement B12, there is one thing worth knowing before you buy anything: not all B12 is the same, and the form matters more than most people realize.
The most common form you’ll find — cyanocobalamin — is synthetic, cheap, and requires your body to convert it before it can actually use it. It also carries a small cyanide molecule in its structure. It is not the one to choose.
What you want is methylcobalamin. This is B12 in its active form — the version your body works with directly, no conversion needed. It absorbs better and stays in the body longer. Some products combine it with adenosylcobalamin, the other active form — the two work together, and that combination is worth looking for.
One more thing: if your digestion is compromised — and if you are genuinely deficient in B12, there is a good chance it is — a tablet you swallow may not be the most effective route. B12 absorption in the gut depends on a protein produced in the stomach. When that system is under strain, sublingual B12 — whether as a tablet dissolved under the tongue or a liquid — bypasses the gut entirely and enters the bloodstream directly. For someone with absorption challenges, that difference is real.
Is Chlorella a Supplement? Why the Answer Matters More Than You Think
When you take an iron supplement, you’re taking a single mineral that has been extracted, isolated, and processed from its original source. What arrives is that compound alone — without the vitamin C that helps your body absorb it, without the companion minerals, without the intelligence of the whole. That’s precisely why isolated iron supplements are so often poorly tolerated — the gut knows something is missing.
Chlorella is something entirely different. It’s a whole organism — a single-celled freshwater algae — consumed completely intact. Whether you take it as powder or tablets, you’re getting the full picture: B12, magnesium, iron, zinc, calcium, chlorophyll, amino acids, and a range of plant compounds that work together exactly as they grew. Nothing has been pulled out. Nothing has been isolated. The tablet isn’t a processed version of chlorella. It is chlorella, compressed.
That’s what makes chlorella a whole food rather than a supplement — even when it comes in a packet. And the B12 it contains is in a form your body actually recognizes.
Making it part of a daily routine is easier than most people expect. A teaspoon of chlorella powder disappears completely in a leafy green smoothie — you won’t taste it. Or a few tablets before bed, which requires almost no thought at all. It fits into what you’re already doing rather than becoming another thing you have to remember.
Spirulina Is Remarkable Too — Here’s How Chlorella and Spirulina Differ
Spirulina shares the same essential quality as chlorella: it is a whole organism, not an extract. What you consume is the complete thing, exactly as nature made it.
The protein content in spirulina is remarkable — it’s one of the most concentrated plant sources you’ll find anywhere, with a complete amino acid profile your body can put straight to work. It’s also rich in iron, B vitamins, and a fatty acid called gamma-linolenic acid that helps the body manage inflammation steadily over time. The deep blue-green color comes from phycocyanin — a pigment with strong antioxidant activity that is one of spirulina’s most studied properties.
My preference is chlorella, for two reasons: the B12 content is more reliable and better absorbed, and chlorella contains significantly more chlorophyll, which supports the liver’s natural clearing processes in ways spirulina doesn’t quite match.
Two extraordinary whole foods. Both are worth knowing and using. Either way, you’re working with nature — not around it.
Why Juicing Helps Even When Your Gut Is Still Healing
One of the most underappreciated things about fresh juice is what it asks of your body: almost nothing.
When you eat a salad, your digestive system has real work to do — breaking things down, separating layers, pulling nutrients through. For someone whose gut is already struggling, that process doesn’t always go well. The nutrients pass through without being fully received.
How your body’s own enzymes work alongside the ones in fresh produce is explained in Digestive Enzymes Explained: How Raw Foods and Juice Help You Absorb More. And if you’re weighing juice against smoothies for digestive ease, Juices vs Smoothies: Which Is Easier on Your Digestion? covers the full comparison.
Fresh juice is different. That work is already done before the glass reaches you. What’s left — the minerals, the vitamins, the plant compounds, the soluble fiber — arrives at your gut in a form it can simply receive. Even a gut that’s inflamed, or still in the middle of healing, can absorb from fresh juice in a way it often can’t manage with the same food eaten whole.
This is why juicing isn’t only a habit for people already feeling well. It’s one of the most practical tools for getting real nutrition in during a period when your system needs support most — a bridge that works even before everything else is fixed.
Getting the nutrients in is one part. Fresh juice, chlorella, dark leafy greens, a diet built around living whole foods — none of it is the answer on its own. They work together, and they work best when the gut behind them is given the conditions to do its job.
The goal was never to find a better supplement. It was to stop needing one.
