Side Effects Reference

Every peptide. Every documented side effect.

Search by symptom (e.g. nausea, headache) or by peptide name. Cross-reference with the safety guide for red flags.

90 peptides shown
5-Amino-1MQFat Loss
Fat Loss
Side effects to know
  • Mild GI upset early in cycle
  • Occasional headache
  • Rare insomnia if dosed late
Targeted fat cell apoptosis research blend
Side effects to know
  • Possible renal stress
  • Fatigue
  • Injection site reactions
AOD-9604Fat Loss
Fat Loss
Side effects to know
  • Mild injection site redness
  • Occasional fatigue
  • Rare nausea
ARA-290Healing
Healing & nerve repair
Side effects to know
  • Mild injection site irritation
  • Rare transient flushing
B12Wellness
Energy, mood & nerve support
Side effects to know
  • Injection site soreness
  • Rare acne flare
  • Bright yellow urine (harmless)
Multi-month recovery protocol with fewer reconstitutions
Side effects to know
  • Same low incidence profile as smaller vials
Active injury repair
Side effects to know
  • Mild injection site warmth or redness
  • Rare dizziness or lightheadedness early in the cycle
  • Occasional headache in the first week
  • No suppression of natural hormone production
Low-dose gut & joint maintenance for short cycles
Side effects to know
  • Rare mild fatigue
  • Occasional injection site redness
Everyday recovery and gut repair for 8-week cycles
Side effects to know
  • Mild dizziness early on
  • Rare appetite change
  • Occasional injection site warmth
Systemic healing & soft tissue repair
Side effects to know
  • Mild lethargy early in cycle
  • Occasional injection site irritation
BronchogenBioregulator
Lungs
Side effects to know
  • Rare mild fatigue
CagrilintideFat Loss
Fat loss & appetite control
Side effects to know
  • Nausea (usually transient)
  • Constipation
  • Reduced appetite leading to undereating
GLP-1 + amylin fat loss blend (Cagrilintide / Semaglutide)
Side effects to know
  • Nausea, constipation, or diarrhea (usually transient)
  • Fatigue
  • Reduced appetite for muscle building nutrition
CardiogenBioregulator
Heart
Side effects to know
  • Rare injection site irritation
CartalaxBioregulator
Joint health
Side effects to know
  • Rare local soreness
CerebrolysinNeuro Cognition
Neurotrophic brain support
Side effects to know
  • Injection site pain
  • Flushing or sweating
  • Dizziness
  • Rare agitation
ChonlutenBioregulator
Respiratory health
Side effects to know
  • Rare nasal irritation if used intranasally
GH pulse / muscle
Side effects to know
  • Injection site redness
  • Head rush feeling for 5–10 min
  • Hand tingling at high doses
Sustained GH / muscle
Side effects to know
  • Water retention
  • Hand/foot tingling
  • Carpal tunnel type symptoms at high doses
CortagenBioregulator
Brain health
Side effects to know
  • Rare mild headache
DIHEXANeuro Cognition
Synaptogenesis & memory
Side effects to know
  • Headache
  • Irritability
  • Insomnia if dosed late
  • Fatigue in some users
DSIPNeuro Cognition
Deep sleep
Side effects to know
  • Vivid dreams
  • Occasional morning fatigue
  • Mild headache
EndolutenBioregulator
Pineal / longevity
Side effects to know
  • Injection site irritation
  • Vivid dreams
  • Rare daytime drowsiness
EpitalonLongevity
Telomere / longevity
Side effects to know
  • Mild drowsiness
  • Rare injection site irritation
Myostatin inhibition
Side effects to know
  • Possible tendon stiffness
  • Mild fatigue
  • Rare joint discomfort
FOXO4-DRILongevity
Senolytic
Side effects to know
  • Flu like symptoms during cycle
  • Fatigue
  • Mild inflammation rebound
Max GH pulse blend (Tesamorelin / CJC-1295 / Ipamorelin)
Side effects to know
  • Numbness/tingling in hands (transient)
  • Injection site flush
  • Mild carb sensitivity in some users
GHK-CuHealing
Skin, hair, healing
Side effects to know
  • Injection site bruising
  • Mild copper taste post injection
  • Rare hypotension at high doses
GHRP-2Muscle
GH release, appetite bump
Side effects to know
  • Water retention
  • Hand tingling
  • Head rush right after injection
  • Mild appetite bump
GHRP-6Muscle
GH release, strong appetite
Side effects to know
  • Intense hunger
  • Water retention
  • Head rush
  • Tingling in hands
GLOW BlendHealing
Skin, hair & systemic healing blend (GHK-Cu 50mg / BPC-157 10mg / TB-500 10mg)
Side effects to know
  • Mild injection site redness or warmth
  • Transient flushing from GHK-Cu
  • Rare lightheadedness early in cycle
GlutathioneLongevity
Master antioxidant & detox
Side effects to know
  • Mild injection site sting (sulfur compounds)
  • Rare transient headache
  • Possible skin lightening with long term high dose use
Master antioxidant & detox
Side effects to know
  • Mild injection site sting (sulfur compounds)
  • Rare transient headache
  • Possible skin lightening with long term high dose use
Master antioxidant & detox
Side effects to know
  • Mild injection site sting (sulfur compounds)
  • Rare transient headache
  • Possible skin lightening with long term high dose use
GonadorelinSexual Health
LH/FSH support
Side effects to know
  • Rare flushing
  • Mild headache
  • Injection site reactions
HCGSexual Health
Testicular function
Side effects to know
  • Estrogen elevation
  • Acne
  • Mood swings at high doses
HexarelinMuscle
GH secretagogue
Side effects to know
  • Hunger spikes
  • Mild cortisol bump
  • Prolactin elevation at high doses
Lipolytic GH fragment
Side effects to know
  • Injection site redness
  • Occasional mild fatigue
  • Rare nausea
IGF-1 DESMuscle
Short-acting site-specific IGF
Side effects to know
  • Local swelling and soreness
  • Occasional lightheadedness
  • Rare hypoglycemia
IGF-1 LR3Muscle
Long-acting IGF-1 analog
Side effects to know
  • Hypoglycemia (shakiness, sweating)
  • Injection site irritation
  • Joint aches
  • Headache
Lean GH pulse
Side effects to know
  • Mild head rush
  • Occasional injection site redness
  • Rare drowsiness
KLOW BlendHealing
Gut, skin & systemic healing blend (GHK-Cu 50mg / KPV 10mg / BPC-157 10mg / TB-500 10mg)
Side effects to know
  • Mild injection site redness
  • Occasional transient flushing
  • Rare GI changes early in cycle
KPVHealing
Gut inflammation
Side effects to know
  • Rare GI upset
  • Mild fatigue early on
L-CarnitineWellness
Fat oxidation & recovery
Side effects to know
  • Injection site burning
  • Fishy body odor at high doses
  • Mild GI upset
LivagenBioregulator
Liver health
Side effects to know
  • Rare GI upset
LL-37Immunity
Antimicrobial
Side effects to know
  • Die off symptoms early on
  • Headache and fatigue
  • Mild injection site irritation
Melanotan 1Pigmentation
Pigmentation
Side effects to know
  • Nausea early on
  • Facial flushing
  • Mole darkening — monitor changes
Melanotan 2Pigmentation
Pigmentation & libido
Side effects to know
  • Nausea
  • Spontaneous erections
  • Facial flushing
  • Mole/freckle darkening
MGFMuscle
Local muscle growth
Side effects to know
  • Local soreness
  • Mild hypoglycemia post injection
  • Injection site lumps
Oral GH secretagogue
Side effects to know
  • Water retention
  • Morning lethargy
  • Numb or tingling hands
  • Raised fasting glucose
Higher-dose immune-modulating protocol
Side effects to know
  • Mild fatigue early on
  • Rare GI upset
MOTS-c — OptimizeMitochondrial
Metabolic & mitochondrial optimization
Side effects to know
  • Mild hypoglycemia in fasted state
  • Rare injection site redness
Mitochondrial + metabolic recomp blend
Side effects to know
  • Mild injection site reaction
  • Rare morning nausea early on
Calm focus (enhanced Selank)
Side effects to know
  • Nasal irritation
  • Mild fatigue
  • Occasional flat affect at high doses
N-Acetyl Semax AmidateNeuro Cognition
Focus & neuroprotection (enhanced Semax)
Side effects to know
  • Nasal irritation
  • Insomnia if dosed late
  • Irritability at high doses
  • Mild headache
NAD+Mitochondrial
Cellular energy
Side effects to know
  • Chest/face flushing if pushed fast
  • Nausea
  • Stomach cramping at IV speed
NAD+ (Nasal)Wellness
Cellular energy via nasal delivery
Side effects to know
  • Nasal irritation or burning
  • Occasional sneezing
  • Rare headache
Cellular energy + detox antioxidant blend
Side effects to know
  • Injection site sting
  • Rare transient flushing
  • Sulfur smell on reconstitution is normal
OvagenBioregulator
Liver / stomach
Side effects to know
  • Rare transient bloating
OxytocinSexual Health
Bonding
Side effects to know
  • Mild nausea
  • Sleepiness
  • Emotional sensitivity
P21Neuro Cognition
Neurogenesis (CNTF-derived)
Side effects to know
  • Headache
  • Fatigue
  • Injection site irritation
PancragenBioregulator
Pancreas health
Side effects to know
  • Rare mild hypoglycemia
PEG-MGFMuscle
Local muscle growth (extended release)
Side effects to know
  • Injection site soreness and swelling
  • Occasional low-grade fatigue
  • Rare local lump
ProstamaxBioregulator
Prostate health
Side effects to know
  • Injection site irritation
  • Rare mild fatigue
PT-141Sexual Health
Libido
Side effects to know
  • Nausea
  • Facial flushing
  • Headache
  • Transient BP increase
Next gen triple agonist + amylin fat loss blend (Retatrutide / Cagrilintide)
Side effects to know
  • Nausea, GI upset, fatigue
  • Increased heart rate in some users
  • Rare gallbladder issues at higher doses
RetatrutideFat Loss
GLP-1/GIP/Glucagon agonist
Side effects to know
  • Nausea or vomiting
  • Diarrhea or constipation
  • Reduced appetite and fatigue
  • Increased heart rate
  • Potential class risks involving gallbladder, pancreas, dehydration, and severe GI symptoms
RetinalaminBioregulator
Retina / vision
Side effects to know
  • Injection site pain
  • Transient blurred vision after peri-ocular administration
  • Rare local swelling
SelankNeuro Cognition
Anxiolytic
Side effects to know
  • Mild nasal irritation
  • Rare headache
SemaglutideFat Loss
GLP-1 agonist
Side effects to know
  • Nausea, vomiting, or abdominal discomfort
  • Constipation or diarrhea
  • Reflux and delayed stomach emptying
  • Gallbladder problems and dehydration
  • Serious persistent abdominal pain needs urgent evaluation
SemaxNeuro Cognition
Focus & neuroprotection
Side effects to know
  • Mild irritability at high doses
  • Nasal irritation
Semax + Selank BlendNeuro Cognition
Focus + calm cognitive blend
Side effects to know
  • Mild headache early on
  • Rare irritability at higher doses
  • Nasal irritation with intranasal use
GHRH analog
Side effects to know
  • Injection site redness
  • Mild headache
  • Rare flushing
Exercise mimetic ERR agonist blend
Side effects to know
  • Sleep disruption if dosed too late
  • Mild GI effects in some users
SS-31Mitochondrial
Mitochondrial protection
Side effects to know
  • Mild injection site reaction
  • Rare GI upset
SurvodutideFat Loss
GLP-1/Glucagon agonist
Side effects to know
  • Nausea
  • Heart rate elevation
  • Fatigue
TaurineWellness
Cardiovascular & CNS support
Side effects to know
  • Injection site sting
  • Mild drowsiness at high doses
  • Rare loose stools
TB-500Healing
Systemic healing
Side effects to know
  • Mild lethargy early in cycle
  • Rare head rush feeling
Visceral fat & GH
Side effects to know
  • Injection site reactions
  • Joint discomfort
  • Mild glucose elevation
GH stack
Side effects to know
  • Hand tingling at high dose
  • Mild head rush
  • Water retention briefly
TestagenBioregulator
Testes / reproductive
Side effects to know
  • Injection site irritation
  • Rare mild headache
ThymalinImmunity
Immune modulation
Side effects to know
  • Injection site redness
  • Rare mild fatigue
Autoimmune
Side effects to know
  • Mild flu like symptoms early on
  • Injection site reactions
Immune support for travel
Side effects to know
  • Mild fatigue early
  • Injection site irritation
ThyreogenBioregulator
Thyroid support
Side effects to know
  • Injection site irritation
  • Rare transient anxiety
TirzepatideFat Loss
GLP-1/GIP agonist
Side effects to know
  • Nausea, diarrhea, or constipation
  • Vomiting, reflux, or abdominal discomfort
  • Reduced appetite and dehydration
  • Gallbladder problems and injection-site reactions
  • Serious persistent abdominal pain needs urgent evaluation
VesiluteBioregulator
Bladder / prostate
Side effects to know
  • Rare mild discomfort
VesugenBioregulator
Blood flow / vascular
Side effects to know
  • Rare mild headache early on
VilonBioregulator
Thymus / immune
Side effects to know
  • Injection site irritation
  • Rare low-grade fatigue
VIPImmunity
Vasoactive immune support
Side effects to know
  • Transient BP drop
  • Flushing
  • Diarrhea at high doses

Side effects listed are the most commonly reported in published literature and user reports. Rare or severe reactions are covered on the safety page. This is educational — not a substitute for medical advice.

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