Vitamins to take while running a peptide protocol

D3 acts more like a hormone than a vitamin — it regulates the receptors involved in muscle protein synthesis, immune signaling and insulin sensitivity. Low D3 blunts almost every recomposition or recovery protocol before it starts.

• Supports lean mass retention during a calorie deficit
• Immune and inflammatory balance
• Improves insulin sensitivity alongside GLP-1 protocols
• Mood and sleep quality

Typical

2,000–5,000 IU daily with a fat-containing meal

Food

Salmon, sardines, egg yolk, sunlight

Pairs with

GLP-1, growth hormone and longevity protocols

D3 raises calcium absorption; K2 decides where that calcium goes. Taken together, calcium is directed into bone rather than soft tissue and arteries.

• Directs calcium to bone, not arteries
• Bone density support during rapid fat loss
• Vascular elasticity

Typical

100–200 mcg daily, taken with D3

Food

Natto, hard cheeses, egg yolk

Pairs with

Anything containing vitamin D3

Magnesium is a cofactor in more than 300 enzymatic reactions including ATP production and protein synthesis. Appetite-suppressing protocols cut food volume, and magnesium is usually the first mineral to fall.

• Muscle cramp and twitch prevention on GLP-1 protocols
• Deeper sleep — where growth hormone pulses happen
• Blood glucose regulation
• Nervous-system calm and recovery

Typical

300–400 mg elemental, evening

Food

Pumpkin seeds, spinach, dark chocolate, almonds

Pairs with

Retatrutide, Tirzepatide, Tesamorelin, Ipamorelin

B12 drives red blood cell formation and methylation. Reduced food intake, metformin use and lower stomach acid all reduce absorption — which is exactly why Lipo-C blends include it.

• Energy output and reduced fatigue
• Nerve health and cognition
• Supports red blood cell formation
• Methylation and homocysteine control

Typical

1,000 mcg daily or 2,500 mcg weekly (sublingual)

Food

Beef, liver, eggs, dairy, fortified foods

Pairs with

Lipo-C, GLP-1 protocols, cognitive stacks

Zinc is required for collagen cross-linking, wound closure and testosterone production. Tissue-repair peptides increase the demand for the raw materials repair actually consumes.

• Faster wound and tendon repair
• Immune function
• Supports natural testosterone
• Skin clarity and healing

Typical

15–30 mg daily with food (balance with 1–2 mg copper)

Food

Oysters, beef, pumpkin seeds, lentils

Pairs with

BPC-157, TB-500, KLOW blend

Collagen literally cannot be synthesized without vitamin C — it is the cofactor for the hydroxylase enzymes that stabilize the collagen triple helix. Running GHK-Cu or a GLOW blend without adequate C limits the ceiling of the result.

• Required cofactor for collagen synthesis
• Antioxidant protection of new tissue
• Improves non-heme iron absorption
• Skin brightness and firmness

Typical

500–1,000 mg daily, split doses

Food

Citrus, bell peppers, kiwi, broccoli

Pairs with

GLOW blend, GHK-Cu, BPC-157, TB-500

EPA and DHA shift the eicosanoid balance toward resolution rather than ongoing inflammation, and DHA is a structural component of neuronal membranes.

• Lowers systemic inflammation so repair peptides work in a cleaner environment
• Joint comfort
• Triglyceride and cardiovascular support
• Cognitive and mood support

Typical

2–3 g combined EPA + DHA daily

Food

Salmon, mackerel, sardines, algae oil

Pairs with

Healing, longevity and cognitive protocols

B1, B2, B3, B5, B6 and folate are the coenzymes of energy metabolism. Fat-loss protocols raise substrate turnover; the B vitamins are what convert that substrate into usable ATP.

• Converts food into usable energy
• Supports the NAD+ pathway via B3
• Reduces the fatigue common in a deficit
• Neurotransmitter production

Typical

One quality B-complex with breakfast

Food

Whole grains, eggs, leafy greens, legumes

Pairs with

NAD+, Lipo-C, GLP-1 protocols

Reduced food and fluid intake drops sodium and potassium fast. Most of the headaches, lightheadedness and 'flat' feeling reported early on a GLP-1 protocol are electrolyte, not peptide, effects.

• Prevents headaches and dizziness
• Maintains training performance
• Reduces muscle cramping
• Supports blood pressure stability

Typical

2–4 g sodium and 3–4 g potassium daily from food plus an electrolyte mix

Food

Sea salt, avocado, potatoes, coconut water

Pairs with

Retatrutide, Tirzepatide, Semaglutide protocols

Not a vitamin, but the most evidence-backed supplement for preserving lean mass and strength — the single biggest risk during aggressive fat loss.

• Protects lean mass in a deficit
• Strength and power output
• Cognitive support under fatigue
• Cell hydration

Typical

5 g daily, timing irrelevant

Food

Red meat, herring (small amounts)

Pairs with

GLP-1 protocols, growth hormone peptides

Choline is required for fat transport out of the liver — the reason it is the 'C' in Lipo-C — and it is the precursor to acetylcholine.

• Supports hepatic fat metabolism
• Memory and focus
• Works with B12 in methylation

Typical

500 mg choline; inositol 1–2 g

Food

Egg yolk, liver, soybeans

Pairs with

Lipo-C, Semax, Selank

Fat loss lowers thyroid output. Selenium is required to convert T4 into active T3, and iodine is the raw material of thyroid hormone itself.

• Supports T4 to T3 conversion
• Protects metabolic rate during a deficit
• Antioxidant enzyme function

Typical

Selenium 100–200 mcg; iodine 150 mcg

Food

Brazil nuts, seaweed, cod, eggs

Pairs with

Long GLP-1 and fat-loss protocols