Best Vitamins & Supplements: Evidence-Based Guides

A registered dietitian’s probiotics guide: match strain to goal, read CFU at expiry, and skip the noise. See what the evidence supports.

Best supplements for allergy season: quercetin, vitamin C, butterbur, and probiotics, ranked by RCT evidence, with trial doses and what to skip now.

Salmon calcitonin has been around long enough that most physicians learned about it before newer bone drugs existed. It was FDA-approved decades ago, once used widely for osteoporosis, and still carries approved indications today. But it also carries something else: a 2014 regulatory narrowing driven by a cancer risk signal and, separately, a long-running question

If you're searching for whether ashwagandha actually helps with sleep, the honest answer is: it can, particularly for stress-driven poor sleep, but the strongest evidence is for sleep quality and efficiency rather than treating primary insomnia outright. This article breaks down what the two most rigorous human RCTs actually showed, including the specific sleep onset

The best supplements for histamine intolerance, ranked by evidence: DAO enzyme, vitamin C, B6, copper, and which probiotic strains are safe for HIT.

A complete guide to iron supplements: heme vs non-heme, ferrous bisglycinate, alternate-day dosing, ferritin testing, who should and should not take them.

If you're weighing ashwagandha vs rhodiola for stress, you're asking a genuinely good question, because the honest answer is: they work through different mechanisms, at different times of day, and for somewhat different stress profiles — neither one is simply better. This article breaks down the RCT evidence for each, where each adaptogen has a

Best supplements for leaky gut, ranked by evidence: L-glutamine, zinc carnosine, probiotics, plus honest framing on a diagnosis mainstream GI does not use.

Naturopath compares quercetin bioavailability across phytosome, EMIQ, and standard aglycone with RCT evidence and honest cost-per-active-mg math.

📚 Researched & cited by UV Editorial Team 2 PubMed sources verified · Last updated: May 15, 2026 · Our research methodology → 🧬 New to peptides? Start with our complete beginner’s guide → Summary: What You Actually Need to Know Here is the question most readers arrive with: are vasopressin and DDAVP the same