Betaine Anhydrous vs Iron Bisglycinate
Performance vs Mineral · evidence-backed comparison
- • Iron Bisglycinate has the stronger evidence base (strong (multiple rcts / meta-analyses)).
- • Iron Bisglycinate has the broader effect profile across the 9 effect categories.
- • Iron Bisglycinate is cheaper per serving ($0.18 vs $0.25).
- • Betaine Anhydrous has a slightly cleaner safety profile.
- • Iron Bisglycinate has higher bioavailability (better absorption).
Side-by-side traits
| Trait | Betaine Anhydrous | Iron Bisglycinate |
|---|---|---|
Category | Performance | Mineral |
Active compound | Trimethylglycine | Ferrous bisglycinate |
Form available | Powder, Capsule | Capsule, Tablet |
Source | plant | synthetic |
Typical dose | 2.5 g daily | 18–25 mg elemental iron |
Dose range | 2.5 g | 18–25 mg |
Loading protocol | — | — |
Best taken with | with meals | vitamin C, empty stomach (or with food if GI sensitive) |
Best time of day | any | morning |
Bioavailability How efficiently the body absorbs and utilizes the compound. | High (4/5) | Very High (5/5) |
Onset time | Cumulative: 2–6 weeks | Cumulative: 4–12 weeks |
Half-life | ~14 hours | — |
Evidence level Quality and quantity of human research. | Moderate (some RCTs) | Strong (multiple RCTs / meta-analyses) |
Overall effect Subjective effect magnitude. | Moderate (3/5) | Moderate (3/5) |
Muscle / strength | Moderate (3/5) | Low (2/5) |
Physical energy | Moderate (3/5) | High (4/5) |
Focus / cognition | Low (2/5) | Moderate (3/5) |
Mood / stress | Low (2/5) | Moderate (3/5) |
Sleep quality | Very Low (1/5) | Low (2/5) |
Immunity | Very Low (1/5) | Low (2/5) |
Recovery Post-exercise recovery support. | Moderate (3/5) | Moderate (3/5) |
Longevity / healthspan | Moderate (3/5) | Very Low (1/5) |
Safety rating 5 = exceptionally well-tolerated; 1 = significant risk profile. | Very High (5/5) | Moderate (3/5) |
Price per serving Approximate USD per typical daily dose. | $0.25 | $0.18 |
Vegan friendly | Yes | Yes |
Gluten free | Yes | Yes |
3rd-party tested | Yes | Yes |
About Betaine Anhydrous
Methyl donor that supports homocysteine recycling and may modestly boost power output. Often paired with creatine in pre-workout formulas.
About Iron Bisglycinate
Best-tolerated iron form for treating deficiency anemia. Don't supplement without a confirmed low ferritin / low Hgb test.
Vetted brands, third-party testing, ships worldwide.
Vetted brands, third-party testing, ships worldwide.
Betaine Anhydrous safety
Common side effects:
- • Fishy body odor (rare)
Avoid if:
- • Kidney disease
Iron Bisglycinate safety
Common side effects:
- • Constipation (less than ferrous sulfate)
- • Dark stools
Avoid if:
- • Hemochromatosis
- • Iron overload
- • Untested males without deficiency
Drug interactions:
- • Levothyroxine
- • Calcium
- • PPIs
Common uses
- • Power output
- • Homocysteine support
- • Liver health
Stacks well with: Creatine Monohydrate, Vitamin B12 (Methylcobalamin)
Common uses
- • Anemia treatment
- • Heavy menstruation
- • Endurance athletes
Stacks well with: Vitamin C
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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.