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THE VELRI LIBRARY

Understand your health. Know what to ask.

Guides to treatments, lab results and common health questions. Sources are listed in every article.

All guides

201 guides · Page 10 of 17
Longevity & PerformanceLongevity

Ferritin and afternoon fatigue: what an iron test can show

Ferritin measures stored iron. Learn why fatigue, inflammation and other blood tests matter when interpreting the result.

Read · 2 min →
Weight & Metabolic

GLP-1 constipation: food, fluids and bowel function

Constipation during GLP-1 treatment can have several contributors. Stool consistency, intake, medicines and warning symptoms all matter.

4 sources · NIHRead · 2 min →
Weight & Metabolic

Can fasting insulin explain a weight-loss plateau?

A fasting insulin result cannot decide whether a medication should change. Learn what glucose tests and a treatment review can clarify.

2 sources · NIHRead · 2 min →
Longevity & PerformanceLongevity

Homocysteine, B12, and trouble concentrating

Homocysteine can contribute to a vitamin-deficiency assessment, but it does not diagnose the cause of brain fog. Learn how the tests fit together.

3 sources · NIHRead · 2 min →
Longevity & PerformanceLongevity

Can peptides speed injury recovery? How to read the claim

Why an injury-recovery claim needs human outcomes, a defined product and a meaningful comparison, not just laboratory results.

3 sources · FDARead · 2 min →
Trust & Safety

Compounded semaglutide: storage, labeling and sterility questions

What to clarify about a compounded semaglutide shipment, including the pharmacy, storage instructions and signs of a delivery problem.

3 sources · FDARead · 2 min →
Trust & Safety

Are peptides medicines or supplements? Read the product category

Peptide describes a molecule. Prescription drugs, compounded preparations, dietary supplements and research chemicals follow different rules.

5 sources · FDARead · 2 min →
Longevity & PerformanceLongevity

Night-shift fatigue: when B12 and folate tests help

B12 and folate deficiencies can contribute to fatigue, but working nights does not establish a deficiency. Diet, absorption and symptoms guide testing.

4 sources · NIHRead · 2 min →
Longevity & PerformanceLongevity

Feeling wired and tired: what cortisol testing can clarify

Cortisol tests investigate specific hormone disorders. How persistent fatigue and difficulty sleeping are evaluated more broadly.

4 sources · Endocrine SocietyRead · 2 min →
Weight & Metabolic

Perimenopause and metabolic health: which numbers add useful context?

Glucose, blood pressure and cholesterol answer different questions when body composition changes in midlife.

4 sources · NIH, PubMed / PMCRead · 2 min →
Weight & Metabolic

Why weight loss can slow during GLP-1 treatment

A smaller body generally needs less energy. A plateau review considers the weight trend, nutrition, activity and treatment response together.

2 sources · NIHRead · 2 min →
Biomarkers & Labs

Positive TPO antibodies with normal thyroid tests: what it means

TPO antibodies can be positive while thyroid function is normal. Learn how antibody results differ from TSH and free T4.

4 sources · NIHRead · 2 min →