Same supplement.
Different brand.
Big difference.
We grade every recommendation by the human trial data behind it, then say plainly who it's for and who should skip it.
- Reviewed
- Researched
- No hype
- Just facts
Same compound
Start with the problem
What are you actually trying to fix?
Pick one and we'll show only what has human trial evidence behind it. Often that's a shorter list than you were hoping for.
Falling asleep, staying asleep, waking up less
2 guides cover this.
The scale itself
Four rungs. Click one to see what earns it.
What earns a strong evidence
Multiple randomized controlled trials in humans, pointing the same way, from independent research groups.
Read the full grading methodInteractive
Read a label the way we do
A typical fish oil panel, line by line. Tap any line to see whether it tells you something real or is there to make the bottle look stronger than it is.
Supplement facts, annotated
Figures are the industry-typical case described in our omega-3 guide, not a specific brand's product.
This number is not the dose
1000mg describes the weight of the oil in the softgel, not the amount of the two omega-3s that actually do anything. This is the single most common reason people take fish oil for months and feel nothing.
Read the omega-3 guideHow we work
Better questions, then healthier choices.
Graded, never ranked
Every guide carries a grade based on trial count, consistency, and effect size. Popularity does not move it. When the evidence is weak, the grade says weak.
Dosing that matches the trials
A "1000mg" fish oil softgel is often 300mg of what actually works. We print the difference.
Who should skip it
Interactions, conditions, and the cases where the research simply does not apply to you.
Everything at a glance
Every supplement we cover, sorted by evidence
Tap a column header to re-sort. Only one compound here earns a strong grade, which tells you most of what you need to know about this category.
| Creatine monohydratePerformance | Strong evidence | 3-5g per day, any time, taken consistently | Build muscleMore energy | Read |
|---|---|---|---|---|
| Vitamin D3Foundational | Moderate evidence | 1000-2000 IU/day for maintenance; higher short-term doses require a blood test and a plan | Immune supportMore energyHeart health | Read |
| Omega-3 (EPA/DHA)Foundational | Moderate evidence | 1-2g combined EPA+DHA per day; check the label, not just the softgel size | Heart healthBetter skin | Read |
| Magnesium glycinateFoundational | Moderate evidence | 200-400mg elemental magnesium per day, in the evening | Sleep betterLower stressBuild muscle | Read |
| AshwagandhaStress & sleep | Moderate evidence | 300-600mg standardized root extract (like KSM-66 or Sensoril) per day | Lower stressSleep better | Read |
Head to head
Two brands, same stated purity, different paperwork
formerly Limitless Life Nootropics
Price transparency
The same compound, from both brands
Three compounds appear in both catalogs. One brand prints the price. The other asks you to register first, which is why half this table cannot be filled in.
| Compound | BioLongevity Labs$55 to $300 typical | Limitless BiotechNot published publicly |
|---|---|---|
| BPC-157 | $99.97view | Login required |
| TB-500 | $164.97view | Login required |
| GHK-Cu | $84.97view | Login required |
Prices as listed on each vendor's own product page on the date shown in their review. Vendors change pricing without notice, so treat these as a snapshot rather than a live quote.
Brands we've reviewed
The products, and what we could actually verify
$99.97
$164.97$84.97
$274.97
$259.97
$129.97
$94.97
$109.97
$99.97
$99.97
$79.97
$55.97
Ranked by documentation
Eight picks, scored on what we could verify
Public COAs, batch-level testing and open pricing. Not health claims, and not paid placements.
The three best-documented listings
Scored on public Certificates of Analysis, batch-level testing, and whether the price is visible without an account.
Start with the ones people ask about most
All guidesLatest, in Stress & sleep
Best Supplements for Sleep, Ranked by How Good the Evidence Is
Four popular options, ordered by how much human trial data sits behind them rather than by how loudly they're marketed.
Read it
What people search for most
The specific questions readers arrive with, each pointing at the guide that answers it.
- Creatine dosage
- Does creatine cause bloating
- Vitamin D3 dosage
- Vitamin D deficiency levels
- How much omega-3 per day
- Magnesium glycinate vs citrate
- Best magnesium for sleep
- Ashwagandha benefits and dosage
- BPC-157 vs TB-500
- Best peptide company
- Third party tested peptides
- BioLongevity Labs review
- Limitless Life Nootropics review
- Best documented research peptides
Evidence-based supplement reviews, in plain English
The Good Supplements publishes evidence-based supplement reviews and dosage guides for the products people actually search for. That means the creatine monohydrate dosage that trials used rather than the one on the tub, what vitamin D3 dosage makes sense once you know your blood level, how much EPA and DHA a fish oil supplement really needs to contain, and whether magnesium glycinate or citrate absorbs better.
Every guide carries an evidence grade. Strong means multiple randomized controlled trials agree. Weak means the claim is running ahead of the data, and we say so rather than hedging. You can read how we grade supplement evidence in full.
Supplement brand reviews and peptide vendors
Alongside the compound guides we review the brands selling them. Our BioLongevity Labs review and Limitless Biotech review, covering the vendor formerly known as Limitless Life Nootropics, check each company's purity testing, Certificate of Analysis transparency, pricing and returns, claim by claim. If you are comparing suppliers, start with how to vet a peptide vendor or the ranked top picks by documentation.
One caveat worth stating up front. Research peptides such as BPC-157 and TB-500 have no approved consumer form, and we cover them as research chemicals rather than supplements you can legally take. The compound guides are the place to start if you want something with real human trial data behind it.
Already taking something? Find out where it stands.
Every guide names the trial dose, the side effects worth knowing, and exactly who the research says should be careful.
hype.See all guides