Most supplement review sites exist to sell you something. GainLab Reviews exists to help you figure out what’s actually worth buying – and what’s a waste of money. There’s a difference, and it matters.
Who is Jake Reynolds?
Jake Reynolds is the founder and lead writer of GainLab Reviews. Jake is a Registered Nurse (RN) with over a decade of clinical experience across hospitals, transitional care facilities, and home health. That career meant working directly alongside physicians, physical therapists, occupational therapists, pharmacists, and specialists across virtually every area of patient care.
That background shapes everything on this site. In clinical healthcare you learn quickly that what’s on a label and what’s actually in a product are not always the same thing. You learn to read research critically, to distinguish between a well-designed study and marketing dressed up as science, and to ask the question most supplement companies hope you won’t ask – what does the actual evidence say?
Most people reviewing supplements online have never read a PubMed study. Jake has spent a career in an environment where evidence-based practice isn’t optional. That’s the foundation GainLab Reviews is built on.
Jake Reynolds is a pen name – the clinical credentials and experience described here are real, but anonymity allows for honest reviewing without professional conflicts of interest.
Why GainLab Reviews exists
After years of watching patients, colleagues, and training partners spend money on supplements based on influencer recommendations, flashy packaging, and claims that have no scientific backing, the need for a genuinely honest supplement resource became impossible to ignore.
The supplement industry is a $50 billion market with almost no meaningful regulation. The FDA does not approve supplements before they go to market. Labels can be misleading. Ingredient doses can be hidden behind proprietary blends. Third-party testing is voluntary. And most review sites are funded by the very brands they’re supposedly reviewing independently.
GainLab Reviews was built to cut through all of that. Every recommendation here is based on ingredient science, clinical dosing research, third-party certification data, and honest evaluation. If a product is overpriced, underdosed, or not backed by credible evidence – we say so directly, regardless of what commission it might earn.
How we research and review
As a practicing RN, understanding pharmacology, drug interactions, and evidence-based clinical research is part of the job – not something learned for this website. Every article on GainLab Reviews follows a consistent research process developed from years of evaluating clinical evidence:
Ingredient analysis first. We start with the research – checking PubMed and peer-reviewed journals for studies on key ingredients and effective doses. A supplement containing an ingredient at half the dose used in research is not the same product, regardless of what the label implies.
Third-party testing. We prioritize products certified by NSF Certified for Sport, Informed Sport, or USP. These certifications mean an independent organization has verified that what’s on the label is actually in the product – and that it doesn’t contain banned substances or harmful contaminants.
Label transparency. We flag proprietary blends, under-dosed ingredients, and misleading marketing claims. A supplement with a transparent label that shows exact doses of every ingredient is always preferable to one hiding behind vague blends.
Real value assessment. We compare cost per serving across products so you can see exactly what you’re paying for. The most expensive product is rarely the best option – and the cheapest isn’t always a compromise.
Regular updates. We revisit articles as new products launch and new research emerges. Supplement science moves quickly and outdated recommendations don’t serve anyone.
What we cover
GainLab Reviews focuses on the supplements and equipment that have genuine evidence behind them and real-world relevance for people who train. That means creatine, protein powder, pre-workout supplements, BCAAs, magnesium, vitamin D, omega-3, multivitamins, and home gym equipment.
We don’t chase every trending supplement or review products simply because they’re popular. If the evidence doesn’t support it we won’t recommend it. There are hundreds of supplements marketed to athletes – maybe a dozen of them are genuinely worth taking. Our job is helping you identify which ones those are.
Our commitment to transparency
GainLab Reviews earns revenue through affiliate commissions – primarily through Amazon Associates. When you click a product link and make a purchase we may earn a small commission at no extra cost to you. These commissions keep the site running and free for everyone who uses it.
Our affiliate relationships do not influence our recommendations. We apply the same critical evaluation to every product regardless of commission rate. In several cases our top-recommended products earn lower commissions than alternatives we chose not to recommend – because the product quality and evidence simply weren’t there.
Every article with affiliate links carries a clear disclosure. We believe transparency about how a site earns money is fundamental to trusting the recommendations that site makes.
A note on supplement safety
Supplements are not regulated the same way medications are. This matters. It means quality varies significantly between brands, label claims don’t require FDA approval, and interactions with medications are possible. The content on GainLab Reviews is intended for informational purposes and does not constitute medical advice.
If you have an existing health condition, take prescription medications, or have specific health concerns – speak with your doctor or a qualified healthcare provider before adding new supplements to your routine. This is not a disclaimer we include reluctantly. It’s advice we genuinely believe in.
Get in touch
Have a question about a supplement, a product you’d like reviewed, or feedback on an existing article? We read every message.
Email: contact@gainlabreviews.com
We typically respond within 48 hours. We particularly welcome questions from readers who want help understanding whether a specific product is worth buying for their specific goals – that’s exactly what GainLab Reviews is here for.