hintl / Nutrition & energy
Nutrition & energy, by the evidence
Supplements and foods for energy, fatigue and nutrient status, each scored by the strength of the published research behind it — study counts, participant totals, and the direction of the evidence, not marketing claims.
15items
supplements & habits
37studies
reviewed
106,552participants
across those studies
hintl editorial team / Nutrition Desk
Nutrition genre desk — research review
For Nutrition & energy, the studies with the strongest track record so far are folic acid (79/100, 2 studies), vitamin C (74/100, 2 studies), and protein (71/100, 3 studies) (hintl Evidence Score, as of October 2026).
Evidence for zinc and branched-chain amino acids is still limited.
Same topic, very different evidence
Even within one topic, how strongly the research backs each option varies widely. Here's what the numbers show.
Ranked by strength of evidence
Tap any item to see the studies behind its score.
79/100
Confidence: high
folic acid
fatigue2 studies8,538 participants
74/100
Confidence: high
vitamin C
fatigue2 studies744 participants
71/100
Confidence: high
protein
energy3 studies204 participants· 1 more outcome
65/100
Confidence: moderate
multivitamin
nutrient status7 studies93,272 participants
62/100
Confidence: moderate
coenzyme Q10
fatigue1 study1,126 participants
62/100
Confidence: moderate
iron
fatigue1 study1,425 participants
42/100
Confidence: low
curcumin
fatigue1 studyparticipant count not recorded
42/100
Confidence: low
ginger
fatigue1 study62 participants
41/100
Confidence: low
vitamin D
fatigue3 studies538 participants
39/100
Confidence: low
probiotics
nutrient status1 study40 participants
39/100
Confidence: low
royal jelly
fatigue1 study20 participants
33/100
Confidence: low
essential amino acids
fatigue4 studies167 participants
29/100
Confidence: very low
whole grains
nutrient status2 studies90 participants
24/100
Confidence: very low
branched-chain amino acids
fatigue2 studies134 participants
0/100
Confidence: very low
zinc
nutrient status3 studies40 participants
Evidence Scores are computed mechanically from the published research (PubMed / Semantic Scholar / OpenAlex): study design, participant numbers, and consistency across studies. An LLM is used only to extract study data, never to decide a score.
This is research-based information, not medical advice, and not a diagnosis. Consult a qualified professional about your own situation.