Supplements That Actually Work (And Those That Do Not)
An honest guide to which supplements have real research behind them, which are marketing, and how to spend $40 per month instead of $300.
Most Supplements Are Marketing
The supplement industry is $150 billion. Most of that is people buying things that do not work. Here is what has actual research behind it, what is neutral, and what is a waste.
Actually Works
Creatine monohydrate — The most studied supplement in sports science. Improves strength, lean mass, and cognitive function. 5g per day, any time. Costs $20 for 6 months.
Whey protein — Not magic, but a convenient way to hit daily protein targets. If you hit your protein from food, you do not need it. If you do not, one scoop per day solves the problem. $40 per month.
Vitamin D — Most men in northern climates are deficient. 2000-4000 IU per day corrects it. Cheap, clearly beneficial, takes 8-12 weeks to fix levels. $10 per year.
Caffeine — The most effective pre-workout compound that exists. 100-300mg 30 minutes before training. Coffee is fine. Pills cost $10 for 100 servings.
Fish oil or algae oil — Mixed evidence, but solid for inflammation and joint health. 2-3g combined EPA/DHA per day. Only matters if you do not eat fatty fish twice a week. $15 per month.
Probably Works
Beta-alanine — Might extend high-rep work. Causes tingling skin. 3-5g per day. Effects are small but real. $15 per month.
Citrulline malate — Some pump and endurance benefits. 6-8g before training. Effects are modest. Skip unless you really want a pump. $15 per month.
Magnesium — If you sleep poorly or cramp, this might help. 200-400mg glycinate before bed. $10 per month.
Waste of Money
Pre-workout blends. $40-60 for caffeine plus filler plus “proprietary blends” that cost $3 to make. Buy caffeine pills.
BCAAs. If you hit your daily protein, you already get them. Studies show zero benefit beyond whole food protein.
Testosterone boosters. None of them raise testosterone in a clinically meaningful way. The ones that work are either illegal or prescription.
Fat burners. Caffeine with other stimulants at 5x the price of caffeine. The “thermogenic effect” is marginal. Real fat loss is dietary.
Joint supplements (glucosamine, chondroitin). Research is mostly negative. Fish oil works better and is cheaper.
Greens powders. Eat vegetables. A $80 greens powder does not replace the fiber and micronutrients of actual broccoli.
The Minimum Stack
If you want to spend as little as possible:
- Creatine monohydrate (5g/day) — $20 for 6 months
- Whey protein (only if needed) — $40/month
- Vitamin D (2000 IU/day) — $10/year
- Caffeine (if you train hard) — $10 for a year
Total: under $50 per month, even with protein. The rest is not worth it for 95% of men.
The Real Supplement
Food. Sleep. Training. These are free or cheap and account for 98% of your results. If you are not getting 8 hours, eating enough protein, and training hard, no stack will save you. Fix the basics first.
Frequently Asked Questions
What supplements actually work for building muscle?
Creatine monohydrate and whey protein are the only two with strong evidence. Everything else has marginal or no effect. Save the rest of the money.
Is creatine safe?
Yes. Creatine is one of the most studied supplements with decades of safety data. 5g per day has no known negative effects on kidneys, liver, or heart in healthy adults.
Do I need pre-workout?
No. 200mg of caffeine from coffee or caffeine pills works better than most pre-workouts and costs 80% less.
Are testosterone boosters legit?
No. Over-the-counter testosterone boosters do not meaningfully raise testosterone. If your T is genuinely low, see a doctor. Do not spend $60 on herbal pills.
Do I need BCAAs or EAAs?
Only if you train fasted. If you eat 3-4 meals with protein per day, you already get all the amino acids you need. BCAA supplements are largely obsolete.
How much protein should I supplement?
Only enough to fill the gap. If you eat 120g of protein from food and need 140g, one scoop of whey covers it. If you already hit your target from food, skip it.
Are fat burners worth it?
Not really. Most "fat burners" are caffeine plus filler. A cup of coffee and a caloric deficit beat any supplement stack for fat loss.
Should I take vitamin D?
If you live in a northern climate or work indoors, almost certainly yes. 2000-4000 IU per day corrects deficiency in 8-12 weeks. Get blood tested to confirm.
Do greens powders work?
They provide some micronutrients but skip the fiber of actual vegetables. Eat real food instead. A $80 monthly greens powder is a $50 monthly vegetable bill.
What is the minimum supplement stack for fitness?
Creatine ($20 for 6 months), vitamin D ($10 per year), and optionally whey protein if you cannot hit protein from food. Under $50 per month total.