Vignette 1 of 1· source #1
Creatine in mild CKD?
Objective · Distinguish creatinine elevation from kidney injury.
A 55-year-old recreational lifter with eGFR 70 asks about creatine.
Best advice?
Curriculum
Module 11 · 60 min
Performance & Cognition — Creatine, Caffeine, Nootropics
Where ergogenic and cognitive supplements have real data, and where they're hype.
CoreClinicalAdvanced
Core topics
Lessons in this module
Learning objectives
By the end of this module you will be able to
- L01Counsel a patient on creatine monohydrate dosing (3–5 g/d) and the absence of kidney harm in healthy adults.
- L02Identify caffeine doses with ergogenic benefit (~3–6 mg/kg) and sleep risks.
- L03Critique nootropic stack marketing using proprietary blends.
- L04Recognize categories of supplements at highest adulteration risk.
Expected takeaways
What you should walk away believing
- →Creatine monohydrate is the best-evidenced ergogenic supplement; 3–5 g/d, no loading required.
- →Caffeine 3–6 mg/kg 30–60 min pre-exercise reliably improves performance.
- →Most nootropic stacks have no RCT; some contain unregulated or undeclared pharmaceuticals.
- →Pre-workout, weight-loss, and 'sexual enhancement' categories have highest adulteration rates.
Lesson · Core emphasis
What this means for you
Patient summary
Creatine is one of the best-studied sports supplements — safe in healthy adults, helps with strength training, and may help muscle in older adults. Caffeine works as a stimulant. Most 'brain pills' don't have evidence behind them.
Clinician summary
Endorse creatine monohydrate for resistance-trained adults and sarcopenia prevention. Discuss caffeine timing/dose. Discourage proprietary 'nootropic' blends; warn about pre-workout adulteration (DMAA, DMHA, stimulant analogs).
Advanced note
Creatine in cognition: meta-analyses show benefit in sleep-deprived states and in some neurodegenerative populations; routine cognitive enhancement claim remains Tier 3. Acute single 0.35 g/kg under 21 h sleep deprivation improved cognition in Gordji-Nejad Sci Rep 2024. Chronic 3–5 g/d achieves muscle saturation in ~28 days (loading optional). Expected serum creatinine rise of 0.1–0.3 mg/dL reflects increased creatine breakdown, not GFR decline — confirm with cystatin C if true GFR is needed (Kreider JISSN 2017 position stand).
Evidence framework
Where this module sits on the device evidence map
Performance: a few clear winners (creatine, caffeine); rest is marketing.
Myth-buster
Creatine damages kidneys.
Reality
In healthy adults, no evidence of kidney harm; raises creatinine modestly (substrate of measurement, not injury).
Evidence-graded claims
What the data says
A
Creatine monohydrate 3–5 g/d improves strength and lean mass with resistance training
Most-studied ergogenic.
A
Caffeine 3–6 mg/kg improves endurance/strength acutely
Consistent.
E
Generic 'nootropic stack' improves cognition long-term
No RCT for most products.
Objective self-check
Test the learning objectives
Score0 / 1(0 answered)
Q1L01 — Creatine and kidneys in healthy adults?
Case vignettes
Apply it: real-world counseling scenarios
Short patient encounters that test your judgment, not your recall. Pick the most defensible response, then reveal the rationale and a sample coaching script you could actually say at the bedside.
Vignette proficiency
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Correct0/1 (0%)Pitfalls avoided0/0 (0%)Composite0
Composite weighting
Accuracy 60%Pitfalls 40%
← all pitfallsbalancedall accuracy →
Composite = 60% answer accuracy + 40% pitfalls avoided. Your weighting is saved for this module.
Order · randomized[1]
Quick check
Test yourself
Q1Creatine dose without loading?
Q2Caffeine ergogenic dose?
Flashcards · Spaced repetition
Lock it in — review what's due
Due2Total2
FrontNew
2 in queueBest-evidence ergogenic supplement?
Click to reveal answer
Glossary
Key terms & abbreviations
- Ergogenic
- Enhances physical performance.
- DMAA / DMHA
- Stimulant adulterants frequently detected in pre-workout supplements; FDA-banned but recurrent.
- Cystatin C
- Endogenous filtration marker for GFR estimation that is unaffected by creatine supplementation; use when chronic creatine causes diagnostic confusion with serum creatinine.
- Phosphocreatine
- High-energy phosphate stored in muscle and brain; rapidly regenerates ATP during short, intense activity — substrate creatine supplementation augments.
Further reading
Optional deeper dive
- ISSN position stand: creatine — JISSN 2017↗
- Single dose of creatine improves cognitive performance during sleep deprivation — Gordji-Nejad et al., Sci Rep 2024↗