Health Reference LibraryNutri Tailor Health Reference Library
Welcome.
When you look for reliable answers to a health topic online, you often run into one of two issues. There's wellness content that's confident but light on evidence. There's also peer reviewed research that's rigorous but locked behind paywalls and written for clinicians.
This library provides best of both worlds. We've gathered the published research and summarised it in plain language: what's been studied, what was found, where the evidence is strong, and where it's still uncertain. Drop by to check one thing, or follow the threads when you want to go deeper.
It's free and every article is fully referenced.
Topics
Iron
37 entries
Magnesium
20 entries
Vitamin D
23 entries
B Vitamins
17 entries
Omega-3
13 entries
Zinc
9 entries
Supplement protocols
5 entries
Adaptogens
3 entries
Blood markers
3 entries
Iron
- Can I take iron supplements with thyroid medication?
- Can iron deficiency raise resting heart rate?
- Does iron compete with calcium for absorption?
- How do I tell iron, B12, and chronic disease anaemia apart?
- How do iron and thyroid dysfunction combine to cause fatigue?
- How do iron, sleep, and stress create a vicious cycle?
- How do iron, thyroid, and mitochondria determine energy levels?
- How do you correct low ferritin effectively?
- How does inflammation mask iron deficiency on ferritin?
- How does iron deficiency impair thyroid function?
- How does iron status specifically affect female fertility?
- How does low ferritin affect focus before anaemia develops?
- How does low ferritin affect sleep quality independently of fatigue?
- How does low ferritin affect thyroid, energy, and cognition?
- How does nutrition help prevent and manage haemorrhoids?
- How does vitamin C affect iron absorption when deficient?
- How is hereditary haemochromatosis managed nutritionally?
- How is restless legs syndrome managed nutritionally?
- How long does iron take to correct deficiency, and when to retest?
- How long does iron take to resolve symptoms and ferritin?
- How long does it take to fully replete iron stores?
- Iron panel normal but still exhausted: what should I check?
- Iron supplementation timeline: when to expect energy improvement?
- Iron supplementation timeline: when to expect sleep improvement?
- Is there a loading protocol for iron supplementation?
- Should I take iron and zinc at the same time?
- What does low ferritin with normal haemoglobin mean?
- What does the full iron panel tell us beyond ferritin alone?
- What enhances and what blocks iron absorption?
- What ferritin level warrants iron supplementation?
- What nutritional support helps with heavy periods and iron loss?
- What's the iron-sleep-stress triad and how does it present?
- Which is best: ferrous sulphate, bisglycinate, or other iron?
- Why do iron, thyroid, and vitamin D deficiencies compound?
- Why does brain iron deficiency cause restless legs?
- Why does inflammation block iron use even with full stores?
- Why isn't iron supplementation improving my energy at 4 weeks?
Magnesium
- Can I take calcium and magnesium together?
- Can I take magnesium with blood pressure medications?
- Does magnesium affect vitamin D conversion?
- How do magnesium, caffeine, and poor sleep deplete each other?
- How do stress and magnesium depletion reinforce each other?
- How do stress, sleep, and magnesium reinforce each other?
- How do vitamin D, K2, and magnesium work together?
- How does magnesium L-threonate differ for brain health?
- How does magnesium status affect heart rate variability (HRV)?
- Magnesium for anxiety and stress: what timeline to expect?
- Magnesium for muscle cramps: how quickly should it work?
- Magnesium for sleep: expected timeline week by week?
- Magnesium: glycinate vs citrate vs malate vs threonate?
- What are the timelines for magnesium's different benefits?
- What magnesium level is actually optimal?
- What's the best time to take magnesium: morning or night?
- What's the correct magnesium dose and timing for migraines?
- When does magnesium lower blood pressure and for whom?
- When does magnesium need therapeutic vs standard dosing?
- Why does stress reduce magnesium's effectiveness for sleep?
Vitamin D
- At what dose does vitamin D become risky without monitoring?
- At what vitamin D level should I recommend supplementation?
- Do low B12 and low vitamin D worsen mood together?
- Do vitamin D and K2 need to be taken together?
- Do vitamin D deficiency and poor sleep compound immune risk?
- Does winter light therapy replace vitamin D supplements?
- How do malabsorption, vitamin D, and low protein compound?
- How do sun exposure and UV affect vitamin D and skin?
- How do thyroid, gut, and vitamin D issues compound each other?
- How does vitamin D deficiency affect sleep and circadian rhythm?
- How long does vitamin D correction take, and at what dose?
- How long does vitamin D take to raise blood levels?
- Vitamin D for mood — timeline for improvement in winter months?
- What affects vitamin D absorption?
- What nutrition shifts in spring as vitamin D synthesis resumes?
- What pattern suggests B vitamin deficiency even with normal B12?
- What's the difference between D2 and D3 and which should I recommend?
- What's the difference: therapeutic vs maintenance vitamin D?
- What's the protocol for loading and maintaining vitamin D?
- What's the vitamin D situation for darker-skinned UK adults?
- When and how much vitamin D should UK adults take in autumn?
- When is a vitamin D loading dose appropriate, and at what dose?
- Why are vitamin D3 and K2 typically combined?
B Vitamins
- Are there risks from long-term high-dose vitamin B6?
- How do B vitamins affect homocysteine and brain/CV health?
- How do B12 injections compare to oral supplements?
- How long does B12 repletion take, including neurological recovery?
- Vitamin B12 supplementation — timeline to resolve deficiency symptoms?
- What are the different forms of choline and when does each apply?
- What B12 level is actually optimal vs just 'normal'?
- What is methylmalonic acid (MMA) and when does it matter?
- What is the preconception nutrition protocol and why 3 months?
- What's a complete prenatal nutrition protocol beyond folate?
- What's the difference between serum B12 and functional B12 testing?
- What's the optimal folate level vs lab reference ranges?
- When are high-dose B vitamins needed vs a standard B complex?
- When does B12 level warrant supplementation vs injections?
- When is a B12 loading protocol needed vs standard oral?
- When should I recommend folate vs folic acid vs methylfolate?
- Which B12: methyl, adenosyl, or hydroxocobalamin?
Omega-3
- Can I take omega-3 fish oil with warfarin or blood thinners?
- Does omega-3 improve HRV, and how quickly?
- Does the omega-3 to omega-6 ratio matter in practice?
- Fish oil, krill oil, or algal oil: which is best for omega-3?
- How long does omega-3 EPA+DHA take to reach therapeutic levels?
- How long does omega-3 take to lower CRP?
- How long does omega-3 take to reach tissues and clinical effect?
- Omega-3 for mood and cognition — what timeline to expect?
- Omega-3 index: what is it, how to test, what to target?
- What are the forms of omega-3 and does structure matter?
- What does the evidence show about seed oils and omega-6?
- What is the omega-3 index and why does it predict longevity?
- What's the difference: therapeutic vs maintenance omega-3?
Zinc
- How does zinc deficiency affect immunity, mood, skin, and hormones?
- How does zinc supplementation affect copper levels?
- How long does zinc take for immunity, skin, and hormones?
- What is the evidence for zinc carnosine for gut barrier function?
- What's the maximum safe dose of zinc long-term?
- Which zinc form is best: picolinate, citrate, or glycinate?
- Why do zinc, vitamin A, and protein deficiencies impair immunity?
- Why does zinc supplementation deplete copper?
- Why is serum zinc unreliable, and what should I test instead?
Supplement protocols
Adaptogens
Blood markers
What you’ll find here
Every entry covers a specific clinical question:
- Forms compared (magnesium glycinate vs citrate vs oxide, iron bisglycinate vs sulphate, vitamin D3 vs D2)
- Dose-response evidence
- Timing and interactions
- Special populations (pregnancy, perimenopause, endurance athletes, people on thyroid medication)
- Testing and lab interpretation
- What guideline bodies (NHS, NICE, SACN, BNF, NIH, Endocrine Society) currently recommend
- Common misconceptions where they exist
What you won’t find
- Personal health advice. The library reports what published research shows; it does not tell you what to do.
- Confident claims that the evidence does not support. Where the research is limited or conflicting, entries say so.
- Hidden commercial bias. Where Nutri Tailor sells a relevant product, there is a soft callout. The clinical content stands on its own.
How entries are reviewed
See how the library is edited and what changes when evidence shifts.