Semaglutide vs SS-31 (Elamipretide)
A detailed comparison to help you understand the differences and choose the right peptide for your research goals.
Semaglutide
Semaglutide is a GLP-1 receptor agonist — a 31-amino acid peptide analog of human glucagon-like peptide-1 (GLP-1) with a 94% sequence homology to native GLP-1. It is FDA-approved for type 2 diabetes (Ozempic, Rybelsus) and chronic weight management (Wegovy). Semaglutide has an albumin-binding fatty acid side chain that extends its half-life to approximately 7 days, enabling once-weekly dosing. It is the most widely prescribed GLP-1 medication globally, with over 25 million Americans expected to be on GLP-1 therapy by 2030.
Full details →SS-31 (Elamipretide)
SS-31, also known as Elamipretide or Bendavia, is a mitochondria-targeted tetrapeptide. It has been studied extensively for mitochondrial diseases, heart failure, and age-related decline in mitochondrial function.
Full details →Side-by-Side Comparison
| Aspect | Semaglutide | SS-31 (Elamipretide) |
|---|---|---|
| Mechanism | Semaglutide binds to and activates the GLP-1 receptor, a G-protein coupled receptor expressed in pancreatic beta cells, the hypothalamus, and the gastrointestinal tract. This triggers multiple downstream effects: (1) glucose-dependent insulin secretion from pancreatic beta cells, (2) suppression of glucagon release from alpha cells, (3) delayed gastric emptying, slowing nutrient absorption, (4) central appetite suppression via hypothalamic GLP-1 receptors, reducing hunger and increasing satiety. The peptide features a C-18 fatty diacid moiety attached via a linker to Lys26, enabling non-covalent albumin binding that protects against DPP-4 degradation and renal clearance. | Concentrates in the inner mitochondrial membrane where it binds to cardiolipin, stabilizing electron transport chain function, reducing reactive oxygen species, and improving ATP production efficiency. |
| Typical Dosage | For weight management (Wegovy): start at 0.25 mg weekly for 4 weeks, escalate to 0.5 mg, 1.0 mg, 1.7 mg, and finally 2.4 mg weekly. Each escalation lasts 4 weeks. Maintenance dose is 2.4 mg weekly. For type 2 diabetes (Ozempic): start at 0.25 mg weekly for 4 weeks, increase to 0.5 mg. May increase to 1 mg, then 2 mg if additional glycemic control is needed. Oral semaglutide (Rybelsus): 3 mg daily for 30 days, then 7 mg daily. May increase to 14 mg daily. Oral Wegovy: 3 mg daily for 4 weeks, escalate to 7 mg, 14 mg, and 25 mg daily. Take on empty stomach with no more than 4 oz of water, 30 minutes before food. | Clinical trials have used IV infusions of 0.25mg/kg for acute conditions. Subcutaneous dosing protocols for research use typically range from 1-5mg daily. |
| Administration | Injectable: subcutaneous injection in the abdomen, thigh, or upper arm. Rotate injection sites. Store pens refrigerated (36-46°F) before first use; after first use, store at room temperature or refrigerated for up to 56 days. Oral: take on an empty stomach with a sip of plain water (no more than 4 oz). Wait at least 30 minutes before eating, drinking, or taking other oral medications. Do not split, crush, or chew tablets. | Can be administered IV or subcutaneously. Most clinical research has used IV administration for cardiac conditions. |
| Side Effects | Very common (>10%): nausea (up to 44%), diarrhea, vomiting, constipation, abdominal pain. These are typically mild-to-moderate and decrease over time with dose escalation. Common (1-10%): headache, fatigue, dyspepsia, dizziness, bloating, flatulence, GERD, gastroenteritis. Notable: 'Ozempic face' (facial volume loss due to rapid weight loss), hair loss (telogen effluvium, reported in 25-33% of users in some studies), injection site reactions. | Generally well-tolerated. Clinical trials reported injection site reactions and occasional headache. |
| Best For |
Key Differences
Unique to Semaglutide:
Unique to SS-31 (Elamipretide):
Detailed Analysis
Commonalities
SS-31 (Elamipretide) and Semaglutide are used for different purposes and have limited overlap in their applications.
Which Should You Choose?
Choose SS-31 (Elamipretide) for Recovery & Healing, Anti-Aging & Longevity. Choose Semaglutide for Fat Loss, Gut Health.
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