Supplements That Actually Help (And Ones That Don't)

The supplement industry is a mess.

I'll just say it. A $50 billion industry that's largely unregulated, makes extravagant claims, and preys on people who are desperate to feel better. A lot of what's sold at your local vitamin store is expensive urine. Sorry. But it's true.

And yet — some supplements genuinely help. They have real research behind them. They address real deficiencies that are common in modern life. They can meaningfully support mental health when used correctly and alongside (not instead of) proper treatment.

The trick is knowing the difference.

I'm going to share the supplements I actually recommend to patients — and why — along with the ones I think are a waste of money. This isn't medical advice for your specific situation. It's me pulling back the curtain on how I think about supplementation in my practice.

The Ones That Actually Help

1. Vitamin D3

Almost everyone I see is deficient. We work indoors. We wear sunscreen. We live far from the equator. Vitamin D deficiency is associated with depression, fatigue, cognitive issues, and immune dysfunction. I test levels and supplement based on results, but most people need 2,000-5,000 IU daily.

The research: Multiple meta-analyses show vitamin D supplementation improves depressive symptoms, especially in people who are deficient. It's not a cure for depression. It's a foundation that makes everything else work better.

2. Omega-3 Fatty Acids (EPA/DHA)

Your brain is literally made of fat. It needs the right kinds to function. Most Western diets are wildly imbalanced — too much omega-6 (inflammatory), not enough omega-3 (anti-inflammatory). This matters for mood, cognition, and inflammation.

The research: Consistent evidence for omega-3s (specifically high-EPA formulations) as adjunctive treatment for depression. Not a replacement for therapy or medication — an addition that supports both.

3. Magnesium Glycinate

Magnesium is involved in over 300 biochemical reactions in your body. Most people don't get enough from food. Deficiency shows up as anxiety, insomnia, muscle tension, headaches, and irritability. Glycinate form is preferred because it doesn't cause GI issues and crosses the blood-brain barrier well.

The research: Multiple studies show magnesium supplementation improves anxiety symptoms, sleep quality, and stress response. It's one of the most well-supported supplements for mental health.

4. B-Complex Vitamins

The B vitamins (especially B6, B9/folate, and B12) are essential for neurotransmitter production. If you're low, your brain literally cannot make enough serotonin, dopamine, or norepinephrine. This is especially relevant if you're on medications that deplete B vitamins, you're a vegetarian/vegan, or you have MTHFR gene variations.

The research: Strong evidence that B vitamin deficiency worsens depression and anxiety. Supplementation helps — particularly methylated forms for people with genetic variations that affect B vitamin processing.

5. L-Theanine

An amino acid found naturally in green tea. It promotes calm alertness without sedation. I recommend it for anxiety that doesn't warrant medication, or as a complement to other treatments.

The research: Good evidence for reducing anxiety and improving focus. Works quickly (30-60 minutes). No dependency risk. Safe to combine with most medications.

6. Probiotics (specific strains)

The gut-brain connection is real and well-documented. Specific probiotic strains have been shown to reduce anxiety, improve mood, and lower cortisol. Not all probiotics are equal — I recommend specific psychobiotic strains (Lactobacillus and Bifidobacterium species with clinical evidence).

The research: Growing body of evidence for "psychobiotics" — specific strains that influence brain function through the gut-brain axis. Still a young field, but promising enough that I include it in my recommendations.

The Ones I Usually Don't Recommend

I'm going to lose some of you with this next part. Some of these are extremely popular on wellness Instagram, and I know people who swear by them. I'm not saying your experience isn't real. I'm saying I can't, in good conscience as a clinician, broadly recommend them. Here's why:

St. John's Wort — Yes, there's evidence for mild depression. But it interacts with EVERYTHING — birth control, antidepressants, blood thinners, immune suppressants. The interaction potential makes it dangerous for most of my patients. And for moderate-to-severe depression, it doesn't work.

5-HTP — Raises serotonin, which sounds great. But it's potentially dangerous if you're on any serotonergic medication (SSRIs, SNRIs, triptans). Serotonin syndrome is real and scary. I can't recommend it broadly.

Ashwagandha — Popular. "Adaptogenic." Some evidence for cortisol reduction. But the evidence is inconsistent, some people react badly, and it can interact with thyroid medications. I'm not against it, but I don't actively recommend it.

Any supplement claiming to "cure" depression/anxiety/ADHD — Run. If a supplement company claims their product cures a mental illness, they're either lying or delusional. Supplements support. They don't cure.

How I Think About Supplements

My framework:

1. Test first. Don't supplement blindly. Know your Vitamin D level, your B12, your iron. Supplement based on data, not guesses.
2. Food first. A supplement fills a gap. It doesn't replace a decent diet.
3. Quality matters. Third-party tested (USP, NSF, ConsumerLab). The FDA doesn't regulate supplements for efficacy or purity. You need someone else verifying what's actually in the bottle.
4. Less is more. You don't need 15 supplements. You need the 2-4 that address your specific deficiencies and needs.
5. Supplements support treatment. They don't replace it. If you need therapy, no amount of magnesium will substitute. If you need medication, fish oil won't cut it. Supplements are the foundation — not the whole building.

The Bottom Line

Some supplements are genuinely useful for mental health. Some are a waste of money. Some are actively dangerous if combined with the wrong medications.

Don't get your supplement advice from Instagram influencers with affiliate links. Talk to a provider who understands both the research and your specific situation.