Fish Oil (Omega-3 EPA/DHA) vs Glycine
Omega / Fatty Acid vs Sleep · evidence-backed comparison
- • Fish Oil (Omega-3 EPA/DHA) has the stronger evidence base (strong (multiple rcts / meta-analyses)).
- • Fish Oil (Omega-3 EPA/DHA) has the broader effect profile across the 9 effect categories.
- • Glycine is cheaper per serving ($0.10 vs $0.35).
- • Glycine has a slightly cleaner safety profile.
- • Glycine has higher bioavailability (better absorption).
Side-by-side traits
| Trait | Fish Oil (Omega-3 EPA/DHA) | Glycine |
|---|---|---|
Category | Omega / Fatty Acid | Sleep |
Active compound | EPA + DHA (eicosapentaenoic + docosahexaenoic acid) | Glycine |
Form available | Softgel, Liquid | Powder, Capsule |
Source | marine | synthetic |
Typical dose | 1–3 g combined EPA+DHA daily | 3 g before bed |
Dose range | 1–3 g | 3–5 g |
Loading protocol | — | — |
Best taken with | fat-containing meal | water, 30 min before bed |
Best time of day | any | evening |
Bioavailability How efficiently the body absorbs and utilizes the compound. | High (4/5) | Very High (5/5) |
Onset time | Cumulative: 4–12 weeks | Acute: 30–60 min |
Half-life | ~37 hours | ~1 hour |
Evidence level Quality and quantity of human research. | Strong (multiple RCTs / meta-analyses) | Moderate (some RCTs) |
Overall effect Subjective effect magnitude. | Moderate (3/5) | Low (2/5) |
Muscle / strength | Moderate (3/5) | Low (2/5) |
Physical energy | Low (2/5) | Very Low (1/5) |
Focus / cognition | Moderate (3/5) | Low (2/5) |
Mood / stress | High (4/5) | Moderate (3/5) |
Sleep quality | Low (2/5) | High (4/5) |
Immunity | Moderate (3/5) | Very Low (1/5) |
Recovery Post-exercise recovery support. | High (4/5) | Low (2/5) |
Longevity / healthspan | High (4/5) | Moderate (3/5) |
Safety rating 5 = exceptionally well-tolerated; 1 = significant risk profile. | High (4/5) | Very High (5/5) |
Price per serving Approximate USD per typical daily dose. | $0.35 | $0.10 |
Vegan friendly | No | Yes |
Gluten free | Yes | Yes |
3rd-party tested | Yes | Yes |
About Fish Oil (Omega-3 EPA/DHA)
Anti-inflammatory fatty acids essential for brain, heart, and joints. Look for IFOS-certified brands; rancid oils undo benefits.
About Glycine
Sweet-tasting amino that lowers core body temperature for deeper sleep. Cheap, well-tolerated, and especially useful with magnesium glycinate.
Vetted brands, third-party testing, ships worldwide.
Vetted brands, third-party testing, ships worldwide.
Fish Oil (Omega-3 EPA/DHA) safety
Common side effects:
- • Fishy burps
- • Loose stools (high doses)
Avoid if:
- • Fish allergy
- • Bleeding disorders
Drug interactions:
- • Anticoagulants
- • Blood pressure meds
Glycine safety
Common side effects:
- • Generally none
Avoid if:
- • Clozapine therapy
Drug interactions:
- • Clozapine
Common uses
- • Heart health
- • Mood / depression
- • Joint inflammation
- • Cognitive aging
Stacks well with: Vitamin D3, Phosphatidylserine
Common uses
- • Deep sleep
- • Sleep quality
- • Collagen synthesis
Stacks well with: Magnesium Glycinate, Melatonin
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Medical disclaimer
SupplementDuel is for educational purposes only and is not medical advice. Consult a physician before starting, stopping, or combining supplements — especially if you are pregnant, breastfeeding, take prescription medication, or have a chronic condition.