Jaclyn Savage, RDN
Registered Dietitian · 8+ years in clinical nutrition
Updated February 2026
After Testing Them All,
This Is the One I Chose
A Registered Dietitian's honest breakdown of 13 greens powders — the science, the taste tests, the ingredient audits, and the one that actually earned a spot in my daily routine.
I'll be honest: I'm usually the last person to recommend a supplement before you've nailed down the basics of your diet. But let's face it — life gets busy. Even our best intentions don't always lead to a daily serving of greens, reds, or anything that vaguely resembles a vegetable.
With so many options on the market, I wanted to cut through the hype and see which powders actually deliver. So I tested today's most talked-about formulas — including AG1, Bloom, and IM8 — and a few others you've probably seen around.
I narrowed it down to 13 of the most popular and highly recommended powders on the internet. For each one, I spent two full weeks tracking everything: energy levels, digestion, taste, mixability, and — most importantly — what's actually in the formula.
The Winner: IM8 Daily Ultimate Essentials Pro
Rated 4.9/5 — the highest score in my testing
IM8 Daily Ultimate Essentials Pro
90 clinically-dosed ingredients · Co-founded by David Beckham · Advisory board from NASA, Mayo Clinic, Cedars-Sinai · NSF Certified for Sport
Try IM8 Risk-FreeCode JAC10 for extra 10% off · 30-day money-back guarantee
The Questions I Know You Have
I've gotten hundreds of DMs about this review. Here are the most common questions — answered honestly.
The Heavy Metals Issue Nobody Talks About
When I compared third-party lab results, the difference was stark. IM8 tested at 90% lower arsenic and cadmium levels than AG1. Both are NSF Certified, but the actual contaminant levels tell a different story.
Arsenic
Cadmium
Side-by-Side: The Top 3
| IM8 | AG1 | Bloom | |
|---|---|---|---|
| My Rating | 4.9/5 | 4.5/5 | 4.2/5 |
| Ingredients | 90 | 75 | 30+ |
| Price/mo | $79 | $79 | $40 |
| NSF Certified | ✓ | ✓ | ✗ |
| Clinical Study | ✓ | ✗ | ✗ |
| Taste Score | 9.2/10 | 7.5/10 | 8.5/10 |
| Heavy Metals | Lowest | Higher | N/A |
| Advisory Board | NASA/Mayo/Cedars | None public | None public |
| Money-Back | 30 days | 90 days | 30 days |
IM8 leads in 7 of 9 categories · Read the full 13-product review →
The Clinical Data
IM8 is one of the few greens powders backed by an independent clinical trial. Here's what the 90-day study found:
95%
More energy
85%
Better gut health
80%
Better sleep
70%
Sharper focus
*Based on a 12-week randomized controlled trial by San Francisco Research Institute
The Deep Dive: What Actually Sets IM8 Apart
After spending weeks with each product, the differences become impossible to ignore. Most greens powders rely on proprietary blends — meaning they can list impressive-sounding ingredients without telling you how much of each is actually in the formula. IM8 is one of the few that uses fully transparent labeling with clinically studied doses.
The advisory board behind IM8 includes experts from NASA, Cedars-Sinai, and the Mayo Clinic. That's not marketing copy — these are physicians and researchers who helped formulate the product. No other brand I tested has anything close to this level of scientific oversight.
Heavy Metals: The Data Most Brands Don't Want You to See
Third-party testing revealed significant differences in heavy metal contamination. Here's how the top 3 compare:
*Based on third-party lab testing. IM8 shows ~90% lower arsenic and cadmium levels than AG1.
The clinical study is what really sealed it for me. A 12-week randomized controlled trial by the San Francisco Research Institute showed 95% of participants reported more energy, 85% better gut health, 80% improved sleep, and 70% sharper focus. These aren't self-reported surveys from the brand's own website — this is independent clinical research.
And here's the thing about taste: IM8 is a reds powder, not a greens powder. It's açaí and mixed berries flavored, and it actually tastes good. I've had greens powders that made me gag. IM8 is the only one I genuinely look forward to drinking every morning.
How I Tested Each Product
I spent 2 weeks with each powder as my sole daily supplement. During each trial, I tracked energy levels, digestive comfort, taste, mixability, and any noticeable changes in skin, sleep, or focus. I also had my bloodwork done before and after the full testing period.
What I Evaluated
- Ingredient transparency & clinical dosing
- Third-party testing & certifications
- Heavy metal contamination levels
- Taste, texture & daily drinkability
My Non-Negotiables
- No proprietary blends
- No artificial sweeteners
- No excessive heavy metals
- No unsubstantiated health claims
The Bottom Line
If you're looking for a single daily supplement that actually delivers on its promises, IM8 is the clear winner. It's not the cheapest option (Bloom wins there at ~$40), and AG1 deserves credit for its generous 90-day money-back guarantee. But when you factor in ingredient quality, clinical backing, heavy metal testing, taste, and overall value — IM8 stands alone.
The 90-day subscription at $79/month (down from $112) makes it competitive with AG1's pricing, but you're getting a product that's been independently validated by a clinical trial and formulated by an advisory board of actual medical professionals.
I've been taking IM8 daily for over 6 months now. My energy is more consistent, my digestion has improved, and I've simplified my entire supplement routine down to one scoop. That's the real win.
More Questions
The one I chose. The one I'd recommend.
After 13 powders, 26 weeks of testing, and hundreds of pages of research — IM8 earned the top spot. Try it risk-free.
Try IM8 Risk-FreeUse code JAC10 for an extra 10% off
IM8 Essentials Pro
$112 → $79/mo · Code: JAC10