Is Glycine Really the Most Anti-inflammatory Nutrient?
What if your body needs three to five times more glycine than it can actually make on its own?
Dr. Joel Brind with Dr. Autumn Smith
Episode aired Apr 3, 2026·Page synthesised Apr 25, 2026·Last reviewed Apr 25, 2026
What this episode covers
- Joel Brind is an endocrinologist and researcher who has spent decades on glycine biology.
- In this interview he makes a careful, mechanistically grounded case that glycine is conditionally essential — the body makes about 3 grams per day, but typical metabolic needs are 10-15 grams per day.
- The gap matters because modern diets are heavy in muscle meat (high in methionine, low in glycine) and light in connective tissue, bone broth, and gelatin (the historical sources of glycine in whole-animal eating).
- Glycine supports glutathione synthesis (the body's master antioxidant), collagen formation, bile acid conjugation, and acts as a calming neurotransmitter.
- Methionine restriction extends lifespan in animals; some research suggests glycine supplementation can mimic part of that effect.
Why it matters
Glycine has gone from 'a basic amino acid' to 'a possibly missing piece' in modern diets. The case isn't dramatic — it's a steady mechanistic story about an amino acid we used to get from connective tissue and bone broth and now mostly don't.
What stands out
- Modern muscle-meat-heavy diets are unbalanced toward methionine; ancestral whole-animal eating was naturally glycine-richer (dietary survey + mechanistic).
- Glycine before bed reduces core body temperature, mimicking the natural pre-sleep cooling (mechanistic + small RCT).
- Methionine restriction extends lifespan in animals — glycine supplementation may capture part of this without protein restriction (animal RCT).
Best-supported action
The single highest-leverage move from this episode, anchored in the strongest evidence the speaker presents.
Add 5-10 g of glycine daily (food or supplement form) if you eat mostly muscle meat with little connective tissue or bone broth.
Where to start
Small low-friction starters covering the main moves from this episode.
- Try bone broth or gelatin in your weekly rotation.
- Take 3 g of glycine before bed if sleep is a focus.
- Eat skin-on, bone-in cuts when convenient.
Other supported actions
Further actions discussed in this episode, ordered from strongest to weakest evidence. This is one expert's view, the full topic compares and ranks across experts.
- Action: Add connective-tissue cuts to your weekly rotation (oxtail, shanks, chicken feet, skin-on cuts, or bone broth). How much glycine you actually need depends on how much muscle meat you eat, your protein-to-plant ratio, and which other glycine sources are already in your diet, and most people overshoot or undershoot the dose. Limitation: Bone broth has variable glycine content depending on simmer time and bone source. Check your source if buying pre-made. Fork: If you don't cook, ready-made bone broth and gelatin powder are reasonable food-form alternatives. Cost of Wrong: Eating only lean muscle meat skews your amino acid profile heavily methionine-loaded, which isn't how humans evolved to eat animals. Reinforce: Whole-animal eating was the historical default. Returning to it covers glycine without supplements.Moderate evidence
- Action: If supplementing, start with 3 g of glycine 30-60 minutes before bed for sleep quality. Limitation: Sleep effects are real but modest. This is not a sleep medication; it's a small adjustment. Fork: If you don't want a supplement, a small bowl of bone broth in the evening provides similar dose with food-form delivery. Cost of Wrong: Taking glycine all day instead of focused at bedtime spreads the effect thin. Reinforce: Three grams before bed is the dose with the most consistent RCT support.Moderate evidence
- Action: For broader anti-inflammatory and methionine-balancing effects, scale up to 5-10 g/day, ideally split between morning and evening. Limitation: This dose range is well within safety data but is at the higher end of what's been studied long-term. Fork: If pursuing this for a specific reason (e.g., glutathione optimization in older adults), pair glycine with NAC (N-acetylcysteine) per the Sekhar et al. RCT. Cost of Wrong: Taking glycine without addressing the broader diet pattern (skipping plants, eating only muscle meat) leaves most of the value on the table. Reinforce: Glycine works as part of a broader whole-foods, varied-protein eating pattern — not as a stand-alone fix.Moderate evidence
Full context, impact ratings, and timing — available in related topics
Questions to take to your doctor
- Given my diet (high muscle meat, low connective tissue), is glycine supplementation reasonable?
- Would a glutathione test reveal anything actionable for me?
- Is there interaction risk between glycine and any of my medications?
Full doctor prep with ranked questions available in the full topic page
Context
Biochemist focused on amino acid metabolism, particularly glycine biology and methionine balance. Approaches health questions through mechanism plus small-RCT validation, not population-level epidemiology. Useful for understanding why a specific nutrient might matter mechanistically; less useful for deciding whether you specifically need it. Has a commercial interest in glycine products; weigh recommendations with that context.
Lifespan claims unproven in humans: animal data and human biomarker shifts exist; longevity endpoints have not been tested in people.
Disease prevention unproven: glycine has not been shown to cure or prevent specific diseases in clinical trials.
Dose specificity unsettled: 3 g for sleep is well-studied; 10-15 g for broader anti-inflammatory effects is less validated long-term.
Food vs supplement equivalence unclear: food-form delivery is plausibly better but unproven against supplements on biomarker outcomes.
Not the same as Seneff's framing: Brind's case rests on methionine balance and glutathione synthesis, not on the contested glyphosate-substitution mechanism.
Where people go wrong
- Conflating Brind's and Seneff's frames on glycine.Brind's case rests on methionine balance and amino acid metabolism. Seneff's rests on a contested glyphosate-substitution mechanism. Don't let one frame discredit or validate the other.
- Taking glycine to compensate for an otherwise poor diet.Glycine is one piece of a broader picture. Without addressing refined carbs, sleep, or movement, supplementation alone won't move the needle.
What to expect over time
- Week 1If sleep effects are present for you, they show up within the first 1-2 weeks at 3 g before bed.
- Months 1-3Inflammation markers and glutathione status (if measured) may shift in adults previously low on connective-tissue intake.
- Months 6+Long-term effects on healthspan are still being studied. Reasonable expectation: modest, compounding contribution to a broader diet pattern.