Proof.Fit

Energy & Fatigue

181 supplements analyzed and ranked by clinical evidence.

Supplements181

Supplement Evidence

Main Effects
Iron

Hb/iron ↑

Fatigue ↓

Strong
302216
Erythropoiesis-Stimulating Agents

Fatigue↓ Hb↑

Energy↑ Hb↑

Strong
218511
Phenylethylamine

Energy↑ Fatigue↓

Heart rate↑ BP↑

Strong
357511
Butyrate

Butyrate↑ fatigue↓

SCFAs↑ energy↓

Strong
251515
Creatine

Strength/fatigue power +

Muscle creatine+PCr boosts

Strong
191214
Caffeine

Endurance +44-51%

Adrenaline/glycerol up

Alertness/fatigue improved

Strong
73611
Vitamin B9

Hb↑, fatigue↓

Anaemia↓, Hb↑

Strong
275814
Fiber

Glucose↓ Fatigue↓

Satiety↑ Energy↑

Strong
364513
Digestive Enzymes

Fat absorption/energy loss

Energy +3.6kg/d

Strong
17077
Whey Protein

Lean mass + insulin

Fat loss + satiety

Strong
66217
Electrolytes

Energy/fatigue +performance

Hydration/electrolytes

Strong
656714
Coenzyme Q10

Heart: pump + symptoms

Fatigue: ↓

Strong
34817
Probiotics

Fatigue ↓, endurance ↑

Strength ↑, fatigue ↓

Strong
294215
Phenylalanine

Phe↑ fatigue↑ -77%

Phe/Tyr depletion ↓ fatigue

Strong
110316
L-Dopa

Energy+fatigue: ↑/↓

Fatigue: +/−

Strong
60613
Multivitamin

Energy/fatigue: +17.2% energy

Sleep: +5.7%

Strong
45018
Melatonin

Less fatigue, better vitality

Fatigue↓, alertness↑, sleep↑

Strong
6547
Vitamin D

Fatigue ↓ +10

Fitness better

Strong
435919
Vitamin C

Fatigue↓, energy↑

O2/iron support

Mood/vitality↑, fatigue↓

Strong
151318
Vitamin B12

MS fatigue↓ 2-4w

B12 biomarkers↑, anemia↓

Exercise fatigue↓ +26%

Strong
95115
Alanine

Fatigue↓, energy↑

Ketosis/alanine shift

Work capacity↑, fatigue↓

Strong
302818
Iodine

Thyroid suppression, +TSH

Goitre shrinkage, iodine rise

Strong
160217
Carnitine

Fatigue ↓

Exercise performance ↑

Strong
47518
L-Carnitine

Fatigue ↓, cognition ↑

Exercise capacity ↑

Strong
46519
Riboflavin

Riboflavin status, +83%

Fatigue/function, -25 pts

Strong
32415
Ginseng

Fatigue ↓, cognition ↑

Exercise capacity ↑, fatigue ↓

Biomarkers improved, fatigue ↓

Strong
27118
Folic Acid

Hb ↑, fatigue ↓

Iron status ↑, fatigue ↓

Strong
274515
L-Tyrosine

Alertness + fatigue

Cognition + vigilance

Strong
325211
NADH

Fatigue↓; NAD+↑

Energy recovery +3.5d

Strong
15716
Prebiotics

Fatigue↓, sleep↑

Energy/metabolism↓ glucose

Strong
76915
Panax Ginseng

Fatigue ↓; energy ↑

~15% VO2 ↓

Fatigue ↓; recovery ↑

Strong
21518
Acetyl-L-Carnitine

Mental fatigue -22.5

Cognition +3.4

Strong
9017
Glutathione

GSH↑, fatigue↓

+8-38% recovery

ATP↑, fatigue↓

Strong
124419
ATP

ATP ↑, fatigue ↓

Energy efficiency ↑

Strong
76111
Vitamin B3

NAD+↑, fatigue↓

Exercise tolerance↑, fatigue↓

Strong
55916
Artemisinin

Malaria↓ anemia↓

+0.6 g/dL Hb

Strong
83912
Essential Amino Acids

Work/fatigue +19-22%

Dyspnea/walk +50m

Energy intake +793 kcal

Strong
262919
Potassium

Energy: improved recovery

Fatigue: reduced exhaustion

Strong
319717
Alpha-Lipoic Acid

Metabolic/oxidative protection

Mitochondrial +30 copies

Strong
21217
Nitrate

Oxidative cost ↓, endurance ↑

Fatigue ↓, cognition ↑

Angina/exercise tolerance ↑

Moderate
98412
Zinc

less fatigue, +43.7

better exercise tolerance, -1.0

improved fatigue/energy, +0.8

Moderate
180417
Vitamin B1

Fatigue ↓, endurance ↑

VO2max/lactate better

Fatigue ↓, appetite ↑

Moderate
26717
Curcumin

Fatigue ↓, energy ↑

Fatigue/weakness ↓, oxygen ↑

Moderate
36418
Docosahexaenoic Acid

fatigue ↓, +74%

physical function ↑, +11%

Moderate
140520
Bitter Orange

Resting energy↑; fatigue↓

HR/BP 0

Moderate
25113
Alfalfa

Intake/gain +

Rumen pH +

Moderate
10811
Glycine

Glucose uptake/flow +24–49%

Hemoglobin/iron + GI better

Moderate
91317
L-Serine

Fatigue -4.4 VAS

Serine↑ / BCAA↓

Hunger↓, GLP-1↑

Moderate
73717
Thiamine

Energy up; fatigue down

VO2↑, lactate↓

Moderate
20515
Ephedrine

Less sedation, -

More energy use +

Better performance +2%

Moderate
56213
Ashwagandha

Sleep/fatigue boosts

Energy/recovery +performance

Moderate
5018
Vitamin B2

Fatigue ↓, endurance ↑

+3.2 min endurance

Moderate
40015
Magnesium

Energy/fatigue +VO2

Energy/fatigue +endurance

Energy/fatigue +recovery

Moderate
183419
Oxiracetam

Cognition +, fatigue?

Attention/memory +

Moderate
139
Branched-Chain Amino Acids

Less fatigue, better endurance

Reduced damage, faster recovery

Moderate
142210
Rhodiola Rosea

less fatigue, lower effort

better endurance, less damage

Moderate
3715
Tryptophan

Sleep/Fatigue: better sleep, less fatigue

Performance: faster recovery, energy

Moderate
41313
Arginine

Fatigue/Arginine ↓

Performance/Endurance ↑

Moderate
125319
Astragalus

Fatigue ↓; endurance ↑

Fatigue ↓; recovery ↑

Moderate
14917
Aspartate

Fatigue ↓

Fatigue ↓ (65%)

Moderate
201718
Nicotine

↓ fatigue, ↑ arousal

+HR/BP, +thermogenesis

Moderate
286215
Beta-Carotene

Less anemia, less fatigue

Improved iron/vitamin A status

Moderate
80713
Beta-Glucans

Lower glucose spikes

Energy/fatigue improved

Moderate
16818
Ginger

Energy↑ BAT activation

Fatigue↓ +9.6

Endurance↑/soreness↓

Moderate
23618
Hawthorn

Exercise capacity↑, symptoms↓

QoL↑, fatigue↓

Moderate
16016
DHEA

Energy/fatigue +67-84%

Mood/fatigue improved

DHEAS normalised

Moderate
48716
Ubiquinol

Energy/fatigue: improved

CoQ10↑, fatigue↓

Exercise recovery: better

Moderate
3115
Alanylglutamine

Energy/fatigue ↑

+26–83%

Recovery/inflammation ↓

Moderate
5412
L-Histidine

Histidine ↓ insulin resistance

Carnosine ↓ glucose

Moderate
15916
Rauwolscine

Sympathetic arousal +

Less fatigue + power

Moderate
8310
Lactoferrin

Hb↑, iron↑

+1.8 to +2.3

hepcidin↓, fatigue↓

Moderate
18815
Ginkgo Biloba

Fatigue ↓; AMS 0%

VO2max ↑; fatigue ↓

Moderate
22317
Beta-Alanine

Delayed fatigue +7–24%

Higher power/endurance +14–22%

Moderate
2546
Reishi

Fatigue ↓28.3%

Fitness/well-being ↑

Moderate
1511
Ornithine

Fatigue↓, sleep↑

Nitrogen balance↑, weight↑

Moderate
11514
White Mulberry

Glucose/insulin spikes ↓

2h iAUC −34%

Moderate
1210
N-Acetyl Cysteine

GSH/mitochondria + fatigue

23.8–26.3% longer

EPO/VO2 preserved

Moderate
62317
Urolithin A

Endurance up; markers down

VO2max +5.4%

Moderate
1517
Barley Grass

Lower fatigue 19%

Less fatigue symptoms

Moderate
5915
Copper

Copper uptake ↓82%

Blood/energy unchanged

Strength/gait ↑

Moderate
64718
Hesperidin

Power/energy: +17.7%, +8.9 W

Soreness/damage: CPK −32.6

Moderate
6416
Astaxanthin

Fatigue ↓, +13

Recovery/efficiency ↑, +1.2%

Moderate
5617
Exogenous Ketones

Ketones ↑, glucose ↓

Fatigue/performance mixed

Exercise fuel shift

Moderate
175
Idebenone

Cognition/function + dose

Respiratory decline +6.27%

Moderate
2411
L-Methionine

Methionine: DMI, milk, protein

Fatigue: cycling +1.4 min

Moderate
34317
Aniracetam

Cognition up; fatigue unchanged

Psychobehavioural up; fatigue unchanged

ADL up; fatigue unchanged

Moderate
76
Ribose

Fatigue improved, QoL +50

Exercise tolerance +53s

Moderate
2067
Guarana

Energy/Fatigue: ↓ fatigue

Energy/Fatigue: ↑ endurance

Moderate
169
Ecklonia Cava

Less fatigue, +2.39 min

Metabolic improvement, body fat ↓

Moderate
36
Akkermansia muciniphila

Fat oxidation + ketones

Muscle strength + VO2max

Moderate
3614
Selenium

Fatigue/appetite better

Nutrition/KPS +23%

Moderate
69617
Theobromine

Alertness + performance

Fatigue/energy boost

Moderate
29412
Glutamine

Glucose/insulin shifts

Cardio-recovery/lipolysis

Moderate
48516
Green Tea Extract

Energy/fatigue: TTE +1.28

Energy/fatigue: REE +12.4%

Energy/fatigue: sleep +3%

Moderate
24417
MCT Oil

↑Ketones, fat use

↓Heart rate, TG

Weak
5311
Taurine

More fat burning

+16% fat oxidation

Less fatigue / longer endurance

Weak
24013
Resveratrol

Energy use +4-8%

Fatigue ↓

Weak
17619
Casein

Satiety + energy

Lower glucose spikes

Slower AA release

Weak
35215
Pea Protein

Lower post-meal sugar

Less hunger / intake

Weak
4514
Artemisia Annua

Faster clearance, less fatigue

Less fatigue, fewer side effects

Weak
159
Lysine

Less sedation; −25%

Improved fatigue? unclear

Weak
36818
Biotin

Better glycemia, +1.76% HbA1c

Lipids improved in subgroups

Weak
657
Vitamin B6

Better endurance +26%

Lower performance -11.6%

Weak
54417
Danshen

Fatigue ↓

Vitality +20.9

Weak
12117
Fucoxanthin

Energy use +12%

Fat burn + aerobic fitness

Weak
512
Pomegranate

Less fatigue, more energy

+REE, +TTE

Weak
10416
Inositol

Fatigue recovery +17.4%

Vigor improved

ALT -1.9 U/L

Weak
27017
Piracetam

Better vigilance, +7.1%

Improved cognition under hypoxia

Weak
15510
Beef Liver

Iron uptake, fatigue risk

+1.5x hepcidin, DMT1↓

Se status, liver genes

Weak
4511
D-Ribose

Energy/fatigue +50 pts

ATP recovery +53 s

Weak
2075
Colostrum

Fatigue -85%; weight +11%

CD4 +14%; weight +11%

Weak
22217
Lecithin

Choline/fat-oxidation boost

Strength/vigor, not fatigue

Weak
14213
Betaine HCL

Energy/Fatigue: ↓ fatigue

Energy/Fatigue: +performance, −fatigue

Weak
1206
Bergamot

Energy/VO2max +

Fatigue/sleepiness +

Weak
3515
Niacin

Fuel shift: FFA↓, carbs↑

NAD+ boost: ~2x

Weak
30813
L-Theanine

Alertness/attention +accuracy

Fatigue/stress - sAA, +sleep

Weak
399
Rosemary

Alertness, less sleepiness

Mental energy +8.15

Weak
7715
Spirulina

Energy/fatigue: +VO2, time-to-fatigue

Energy/fatigue: ↓MDA, ↑SOD/GSH

Energy/fatigue: +32% TE

Weak
5518
Policosanol

Exercise capacity +VO2max

Walking distance +55-59%

Weak
6512
Palmitoylethanolamide

Fatigue/cognition: GABAB + plasticity

Pain/inflammation: reduced pain, IL-6

Weak
4618
Schisandra

Strength ↑ +7.7–10.2

Lactate ↓, no mass change

Weak
1214
Choline

Fatigue improved +14%

Energy/autonomic +10%

Weak
76218
Matcha

Attention + work, +2.2

Fatigue/stress lower, cortisol

Weak
1113
Theanine

Alertness, less fatigue

Reaction time, +15–20 ms

Weak
3915
Sarcosine

Depression, remission +

Early mood +

Weak
3810
Quercetin

Endurance +3–13%

Strength +10%

Weak
14219
Arachidonic Acid

Intake↑; AA↑ (+25%)

Taste↑; AA↑ (+50%)

Weak
59519
Citrulline

Endurance +36%

Reps +10–21%

Weak
23013
PQQ

Mitochondrial ↑; fatigue unchanged

Performance no change

Weak
68
Caprylic Acid

Less fatigue, +10.5 ketones

Lower fat oxidation, -24%

Fat oxidation up, mixed

Weak
346
Coptis

Better glucose control

HbA1c −0.75%

Weak
913
S-Adenosyl Methionine

Fatigue/pruritus better

Bilirubin/AP ↓

Weak
8214
Huperzine A

No energy/fatigue impact

Cognition/ADL +4.6

Weak
129
Pine Bark Extract

Energy/fatigue +17%

Energy/fatigue -42.8%

Energy/fatigue improved

Weak
5318
Berberine

↑ LVEF, walk capacity

↓ VPCs; 7 vs 13 deaths

Weak
9916
Perilla Oil

Lower glucose spikes

−0.67 mmol/L FBG

Weak
77
Bee Pollen

+7.96% WBC, growth

improved FCR, energy

Weak
25
Krill Oil

Strength +9–11%

Muscle size +3.5%

Weak
3815
Phosphatidylserine

Memory tests + MQ

Perceived fatigue lower

Weak
5811
Benfotiamine

Higher thiamine/TDP exposure

+1147% plasma thiamine

Better ETK, fatigue

Weak
209
White Kidney Bean

Lower glucose load

Less fatigue risk

Better satiety +51%

Weak
510
Eleuthero

Less burnout, mood

+12% VO2, +23% endurance

Weak
2011
Siberian Ginseng

Burnout ↓

VO2peak +12%

Weak
2111
Dendrobium

BP up +3.4-5.4

Energy/focus up

Weak
36
Ursolic Acid

Faster walking, less fatigue

Mitochondria up, +7.4s walk

Weak
56
Citicoline

Better neurological energy

Seizures reduced significantly

Weak
7614
Desiccated Thyroid

T3↑, T4↓

Symptomatic subgroup improved

Weak
97
Saffron

Fatigue scores down

Physical/cognitive fatigue down

Weak
10718
Grains of Paradise

Energy up, BAT active

+18.6% EE, less fat

Weight down, EE up

Weak
17
Alpha-Linolenic Acid

Fat oxidation ↑

ALA-DAG +17%

Weak
31119
Shilajit

Less fatigue, -7.1pp

Collagen breakdown, -38%

Weak
68
Kelp

Antioxidants up; fatigue↓

Brain factors up; energy↑

Weak
4812
Alpha-Ketoglutarate

Lower injury, lactate

More α-KG, power

Weak
6910
Fenugreek

Anxiety, symptoms ↓

Grip strength ↑

Weak
3213
Mannose

Fat loss, -2.7 kg

Weight loss, -2.7 kg

Weak
757
Salacia Reticulata

Lower HbA1c, less fatigue

−0.36 HbA1c, dose↓

Weak
1110
Agaricus Blazei

Fatigue -15%

Vitality +21%

Weak
78
Carnosine

Endurance threshold +13.9%

+6% sprint power

Weak
7717
Centrophenoxine

Hydration +2.5%

Cognition improved

Weak
45
Wild Yam

Less dyspnea, better stamina

6MWD up; dyspnea down

Weak
1111
Capsaicin

Higher fat burn/+48% BAT

Less fatigue/+23% lift

Weak
24618
Moringa

Endurance + push-ups

Oxidative stress ↓

Weak
2512
Vanadium

Better glucose control

Less insulin resistance

Weak
116
Vinpocetine

Hb +0.10

DSI +25.8

Weak
188
L-Citrulline

Power +5%; NO↑

Soreness −40%; reps +53%

BP↓; cycling efficiency↑

Weak
11711
Boron

Oxygenation up, fatigue down +4.8%

Inflammation down, energy up −42.9 mg/L

Weak
1808
Cranberry

Insulin sensitivity +14%

Glucose/insulin lowering

Weak
11014
St. John's Wort

Fatigue/sleep improved

70% symptom-free

Weak
9711
Epigallocatechin Gallate

EE ↑ ~4%

Fat oxidation ↑

Weak
10919
Flaxseed Oil

Lower fatigue; hepcidin -25%

More energy; hemoglobin +10%

Weak
11617
Gamboge

Glycogen +100%, insulin ↓

Strength/lean mass ↑

Weak
2710
Rutin

Strength +13%; gait +8%

Muscle thickness +3-5%

Weak
8613
Adrafinil

Locomotion/alertness +

Sniffing -

Weak
12
GlyNAC

GSH, mitochondria up

Oxidative stress down

Weak
16
Red Yeast Rice

LDL/CRP/ET-1 ↓

Exercise tolerance ↑

Weak
6814
Phosphatidylcholine

Mitochondria + OXPHOS

Phospholipids, PC:PE↓

Weak
29617
Goji Berry

Energy↑, fatigue↓

PPEE +10%

Weak
1917
Mucuna Pruriens

Energy/Fatigue up

+25% ON time

Energy/Fatigue up +70 min

Weak
19
Terminalia Arjuna

LVEF ↑; fatigue ↓

Ventricular performance ↑; RPE ↓

Weak
3315
Beet Root

↓O2 cost, +endurance

−RPE / faster sprint

Weak
107
Yohimbine

↑Arousal/HR: +50 NE

↓Sedation/Fatigue: -60 min

Weak
798