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QP Journal

The science behindperformance.

Read about sports pharmacology, supplements, recovery and health. QP Journal explores mechanisms, published evidence, uncertainties and potential risks.

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Health2026-09-27

Anxiety: prevention, assessment and when to seek help

Anxiety in the context of training and everyday life: possible contributors, assessment, prevention strategies and signs that professional support may be needed.

Editorial team QP Journal

Health2026-09-27

High or low bilirubin in athletes: causes and interpretation

Understand what bilirubin measurements can indicate in athletes, why results need clinical context and which accompanying symptoms call for medical assessment.

Editorial team QP Journal

Pharmacology2026-09-27

Epitalon: storage, reconstitution and stability

Epitalon stability, storage and reconstitution discussed alongside contamination risks, uncertain product quality and the limits of evidence for research peptides.

Editorial team QP Journal

Pharmacology2026-09-27

Finasteride side effects and how they are interpreted

A guide to reported finasteride side effects, sexual symptoms, mood concerns and uncertainties in the evidence, with context for discussions with a clinician.

Editorial team QP Journal

Pharmacology2026-09-27

Fluoxymesterone: the history and medical use of Halotestin

Trace the development and medical history of fluoxymesterone, also known as Halotestin, and understand how its effects and adverse reactions shaped its use.

Editorial team QP Journal

Recovery2026-09-27

Hydration and electrolytes: understanding fluid balance

Explore fluid balance, sodium and other electrolytes during exercise, with context for sweat losses, recovery and the risks of both too little and too much fluid.

Editorial team QP Journal

Pharmacology2026-09-27

Isotretinoin and interactions with other medicines

Understand important interaction concerns with isotretinoin, including other medicines and supplements, and why a complete medication review matters before treatment.

Editorial team QP Journal

Recovery2026-09-27

Libido recovery after anabolic steroid use

Why libido may change after anabolic steroid use, how hormonal recovery varies and why symptoms should be assessed rather than managed through guesswork.

Editorial team QP Journal

Supplements2026-09-27

Mass gainers: common myths and realistic expectations

Mass gainer claims explained through energy intake, protein and training. Learn how nutrition context changes expectations and why a supplement is not a shortcut.

Editorial team QP Journal

Pharmacology2026-09-27

RAD-140 and ligandrol: mechanisms, evidence and side effects

Compare RAD-140 and ligandrol across proposed mechanisms, published research and potential adverse effects, while separating evidence from untested assumptions.

Editorial team QP Journal

Pharmacology2026-09-27

S23: what preclinical research shows and what remains unknown

Assess the available research on S23, the distinction between animal studies and human trials, and the major uncertainties around its effects and safety.

Editorial team QP Journal

Pharmacology2026-09-27

Salbutamol: common myths about effects and safety

Examine common claims about salbutamol in sport, including performance expectations, side effects and the difference between medical use and unsupported assumptions.

Editorial team QP Journal

Pharmacology2026-09-27

Tesamorelin side effects: what the evidence shows

An overview of reported tesamorelin side effects, metabolic concerns and the limits of the evidence, with context for interpreting symptoms and medical monitoring.

Editorial team QP Journal

Pharmacology2026-09-27

How testosterone enanthate affects androgen receptors and protein synthesis

Explore how testosterone enanthate acts on androgen receptors and protein synthesis, with a clear distinction between biological mechanisms and health risks.

Editorial team QP Journal

Pharmacology2026-09-27

Testosterone isocaproate: common myths and what the evidence says

Common claims about testosterone isocaproate examined, including ester duration, hormone effects and safety. Learn where expectations exceed the available evidence.

Editorial team QP Journal

Supplements2026-09-27

Tongkat ali: dosage, timing and duration in context

Tongkat ali intake and research doses in context, including extract differences, timing, study limitations and why safety cannot be inferred from marketing claims.

Editorial team QP Journal

Pharmacology2026-09-27

Trenbolone acetate: estrogenic and progestogenic activity

Understand the distinction between estrogenic and progestogenic activity of trenbolone acetate, the limits of current evidence and the implications for health.

Editorial team QP Journal

Supplements2026-09-27

Zinc picolinate and zinc gluconate: differences and side effects

Zinc picolinate and zinc gluconate compared: formulation, absorption evidence, elemental zinc content and side effects to consider when interpreting supplement labels.

Editorial team QP Journal

Supplements2026-09-27

ZMA for athletes: what does the evidence support?

Review the evidence for ZMA in athletes, including zinc, magnesium and vitamin B6, deficiency, recovery claims and the limits of performance-related research.

Editorial team QP Journal