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.

67 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

Adipotide BlendFat Loss

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

BPC-157 — InjuryHealing

Active injury repair

Side effects to know

Mild injection site warmth
Rare dizziness early in cycle

BPC-157 — Repair (10mg vial)Healing

Recovery & gut repair

Side effects to know

Mild dizziness early on
Rare appetite change

BPC-157 — Repair (20mg vial)Healing

Recovery & gut repair

Side effects to know

Same low incidence profile as smaller vials

BPC-157 — Repair (5mg vial)Healing

Recovery & gut repair

Side effects to know

Rare mild fatigue
Occasional injection site redness

BPC-157 / TB-500 BlendHealing

Systemic healing

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

CagriSema BlendFat Loss

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

ChonlutenBioregulator

Respiratory health

Side effects to know

Rare nasal irritation if used intranasally

CJC-1295 No DACMuscle

GH pulse / muscle

Side effects to know

Injection site redness
Head rush feeling for 5–10 min
Hand tingling at high doses

CJC-1295 W/ DACMuscle

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

DSIPNeuro Cognition

Deep sleep

Side effects to know

Vivid dreams
Occasional morning fatigue
Mild headache

EpitalonLongevity

Telomere / longevity

Side effects to know

Mild drowsiness
Rare injection site irritation

Follistatin 344Muscle

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

GH Trifecta BlendMuscle

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

GLOW BlendHealing

Skin, hair & systemic healing blend (GHK-Cu / BPC-157 / TB-500)

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

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

IpamorelinMuscle

Lean GH pulse

Side effects to know

Mild head rush
Occasional injection site redness
Rare drowsiness

KLOW BlendHealing

Gut, skin & systemic healing blend (KPV / GHK-Cu / BPC-157 / TB-500)

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

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

MOTS-c — AutoimmuneMitochondrial

Mitochondrial function

Side effects to know

Mild fatigue early on
Rare GI upset

MOTS-c — OptimizeMitochondrial

Mitochondrial function

Side effects to know

Mild hypoglycemia in fasted state
Rare injection site redness

MOTS-c + 5-Amino-1MQ BlendMitochondrial

Mitochondrial + metabolic recomp blend

Side effects to know

Mild injection site reaction
Rare morning nausea early on

NAD+Mitochondrial

Cellular energy

Side effects to know

Chest/face flushing if pushed fast
Nausea
Stomach cramping at IV speed

NAD+ / Glutathione BlendMitochondrial

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

PancragenBioregulator

Pancreas health

Side effects to know

Rare mild hypoglycemia

PT-141Sexual Health

Libido

Side effects to know

Nausea
Facial flushing
Headache
Transient BP increase

Reta + Cagri BlendFat Loss

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, vomiting
Constipation/diarrhea
Fatigue
Heart rate elevation

SelankNeuro Cognition

Anxiolytic

Side effects to know

Mild nasal irritation
Rare headache

SemaglutideFat Loss

GLP-1 agonist

Side effects to know

Nausea
Constipation
Reflux
Fatigue early in titration

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

SermorelinMuscle

GHRH analog

Side effects to know

Injection site redness
Mild headache
Rare flushing

SLU-PP-332 BlendFat Loss

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

TB-500Healing

Systemic healing

Side effects to know

Mild lethargy early in cycle
Rare head rush feeling

TesamorelinMuscle

Visceral fat & GH

Side effects to know

Injection site reactions
Joint discomfort
Mild glucose elevation

Tesamorelin / Ipamorelin BlendMuscle

GH stack

Side effects to know

Hand tingling at high dose
Mild head rush
Water retention briefly

ThymalinImmunity

Immune modulation

Side effects to know

Injection site redness
Rare mild fatigue

Thymosin Alpha 1 — AutoimmuneImmunity

Immune modulation

Side effects to know

Mild flu like symptoms early on
Injection site reactions

Thymosin Alpha 1 — TravelImmunity

Immune support for travel

Side effects to know

Mild fatigue early
Injection site irritation

TirzepatideFat Loss

GLP-1/GIP agonist

Side effects to know

Nausea
Constipation
Reflux
Injection site reactions

VesiluteBioregulator

Bladder / prostate

Side effects to know

Rare mild discomfort

VesugenBioregulator

Blood flow / vascular

Side effects to know

Rare mild headache early on

VIPImmunity

Vasoactive immune support

Side effects to know

Transient BP drop
Flushing
Diarrhea at high doses

Wolverine BlendHealing

Heavy duty injury & joint repair blend (BPC-157 / TB-500 / GHK-Cu)

Side effects to know

Mild injection site redness
Transient flushing
Rare lightheadedness early in cycle

Peptide	Category	Side effects to know
5-Amino-1MQ Fat Loss	Fat Loss	Mild GI upset early in cycle Occasional headache Rare insomnia if dosed late
Adipotide Blend Targeted fat cell apoptosis research blend	Fat Loss	Possible renal stress Fatigue Injection site reactions
AOD-9604 Fat Loss	Fat Loss	Mild injection site redness Occasional fatigue Rare nausea
ARA-290 Healing & nerve repair	Healing	Mild injection site irritation Rare transient flushing
BPC-157 — Injury Active injury repair	Healing	Mild injection site warmth Rare dizziness early in cycle
BPC-157 — Repair (10mg vial) Recovery & gut repair	Healing	Mild dizziness early on Rare appetite change
BPC-157 — Repair (20mg vial) Recovery & gut repair	Healing	Same low incidence profile as smaller vials
BPC-157 — Repair (5mg vial) Recovery & gut repair	Healing	Rare mild fatigue Occasional injection site redness
BPC-157 / TB-500 Blend Systemic healing	Healing	Mild lethargy early in cycle Occasional injection site irritation
Bronchogen Lungs	Bioregulator	Rare mild fatigue
Cagrilintide Fat loss & appetite control	Fat Loss	Nausea (usually transient) Constipation Reduced appetite leading to undereating
CagriSema Blend GLP-1 + amylin fat loss blend (Cagrilintide / Semaglutide)	Fat Loss	Nausea, constipation, or diarrhea (usually transient) Fatigue Reduced appetite for muscle building nutrition
Cardiogen Heart	Bioregulator	Rare injection site irritation
Cartalax Joint health	Bioregulator	Rare local soreness
Chonluten Respiratory health	Bioregulator	Rare nasal irritation if used intranasally
CJC-1295 No DAC GH pulse / muscle	Muscle	Injection site redness Head rush feeling for 5–10 min Hand tingling at high doses
CJC-1295 W/ DAC Sustained GH / muscle	Muscle	Water retention Hand/foot tingling Carpal tunnel type symptoms at high doses
Cortagen Brain health	Bioregulator	Rare mild headache
DSIP Deep sleep	Neuro Cognition	Vivid dreams Occasional morning fatigue Mild headache
Epitalon Telomere / longevity	Longevity	Mild drowsiness Rare injection site irritation
Follistatin 344 Myostatin inhibition	Muscle	Possible tendon stiffness Mild fatigue Rare joint discomfort
FOXO4-DRI Senolytic	Longevity	Flu like symptoms during cycle Fatigue Mild inflammation rebound
GH Trifecta Blend Max GH pulse blend (Tesamorelin / CJC-1295 / Ipamorelin)	Muscle	Numbness/tingling in hands (transient) Injection site flush Mild carb sensitivity in some users
GHK-Cu Skin, hair, healing	Healing	Injection site bruising Mild copper taste post injection Rare hypotension at high doses
GLOW Blend Skin, hair & systemic healing blend (GHK-Cu / BPC-157 / TB-500)	Healing	Mild injection site redness or warmth Transient flushing from GHK-Cu Rare lightheadedness early in cycle
Glutathione Master antioxidant & detox	Longevity	Mild injection site sting (sulfur compounds) Rare transient headache Possible skin lightening with long term high dose use
Gonadorelin LH/FSH support	Sexual Health	Rare flushing Mild headache Injection site reactions
HCG Testicular function	Sexual Health	Estrogen elevation Acne Mood swings at high doses
Hexarelin GH secretagogue	Muscle	Hunger spikes Mild cortisol bump Prolactin elevation at high doses
Ipamorelin Lean GH pulse	Muscle	Mild head rush Occasional injection site redness Rare drowsiness
KLOW Blend Gut, skin & systemic healing blend (KPV / GHK-Cu / BPC-157 / TB-500)	Healing	Mild injection site redness Occasional transient flushing Rare GI changes early in cycle
KPV Gut inflammation	Healing	Rare GI upset Mild fatigue early on
Livagen Liver health	Bioregulator	Rare GI upset
LL-37 Antimicrobial	Immunity	Die off symptoms early on Headache and fatigue Mild injection site irritation
Melanotan 1 Pigmentation	Pigmentation	Nausea early on Facial flushing Mole darkening — monitor changes
Melanotan 2 Pigmentation & libido	Pigmentation	Nausea Spontaneous erections Facial flushing Mole/freckle darkening
MGF Local muscle growth	Muscle	Local soreness Mild hypoglycemia post injection Injection site lumps
MOTS-c — Autoimmune Mitochondrial function	Mitochondrial	Mild fatigue early on Rare GI upset
MOTS-c — Optimize Mitochondrial function	Mitochondrial	Mild hypoglycemia in fasted state Rare injection site redness
MOTS-c + 5-Amino-1MQ Blend Mitochondrial + metabolic recomp blend	Mitochondrial	Mild injection site reaction Rare morning nausea early on
NAD+ Cellular energy	Mitochondrial	Chest/face flushing if pushed fast Nausea Stomach cramping at IV speed
NAD+ / Glutathione Blend Cellular energy + detox antioxidant blend	Mitochondrial	Injection site sting Rare transient flushing Sulfur smell on reconstitution is normal
Ovagen Liver / stomach	Bioregulator	Rare transient bloating
Oxytocin Bonding	Sexual Health	Mild nausea Sleepiness Emotional sensitivity
Pancragen Pancreas health	Bioregulator	Rare mild hypoglycemia
PT-141 Libido	Sexual Health	Nausea Facial flushing Headache Transient BP increase
Reta + Cagri Blend Next gen triple agonist + amylin fat loss blend (Retatrutide / Cagrilintide)	Fat Loss	Nausea, GI upset, fatigue Increased heart rate in some users Rare gallbladder issues at higher doses
Retatrutide GLP-1/GIP/Glucagon agonist	Fat Loss	Nausea, vomiting Constipation/diarrhea Fatigue Heart rate elevation
Selank Anxiolytic	Neuro Cognition	Mild nasal irritation Rare headache
Semaglutide GLP-1 agonist	Fat Loss	Nausea Constipation Reflux Fatigue early in titration
Semax Focus & neuroprotection	Neuro Cognition	Mild irritability at high doses Nasal irritation
Semax + Selank Blend Focus + calm cognitive blend	Neuro Cognition	Mild headache early on Rare irritability at higher doses Nasal irritation with intranasal use
Sermorelin GHRH analog	Muscle	Injection site redness Mild headache Rare flushing
SLU-PP-332 Blend Exercise mimetic ERR agonist blend	Fat Loss	Sleep disruption if dosed too late Mild GI effects in some users
SS-31 Mitochondrial protection	Mitochondrial	Mild injection site reaction Rare GI upset
Survodutide GLP-1/Glucagon agonist	Fat Loss	Nausea Heart rate elevation Fatigue
TB-500 Systemic healing	Healing	Mild lethargy early in cycle Rare head rush feeling
Tesamorelin Visceral fat & GH	Muscle	Injection site reactions Joint discomfort Mild glucose elevation
Tesamorelin / Ipamorelin Blend GH stack	Muscle	Hand tingling at high dose Mild head rush Water retention briefly
Thymalin Immune modulation	Immunity	Injection site redness Rare mild fatigue
Thymosin Alpha 1 — Autoimmune Immune modulation	Immunity	Mild flu like symptoms early on Injection site reactions
Thymosin Alpha 1 — Travel Immune support for travel	Immunity	Mild fatigue early Injection site irritation
Tirzepatide GLP-1/GIP agonist	Fat Loss	Nausea Constipation Reflux Injection site reactions
Vesilute Bladder / prostate	Bioregulator	Rare mild discomfort
Vesugen Blood flow / vascular	Bioregulator	Rare mild headache early on
VIP Vasoactive immune support	Immunity	Transient BP drop Flushing Diarrhea at high doses
Wolverine Blend Heavy duty injury & joint repair blend (BPC-157 / TB-500 / GHK-Cu)	Healing	Mild injection site redness Transient flushing Rare lightheadedness early in cycle

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.