Starting doses (2.5mg) are designed for tolerance, not weight loss. Most significant weight loss occurs at 5–10mg. If you have been at 2.5mg for more than 4 weeks without results, consider titrating up.
FIXTitrate to the next dose level as per the standard protocol.
Research-grade peptides can contain less than labeled. A vial claiming 10mg may only contain 7–8mg due to manufacturing variance or intentional underdosing.
FIXVerify COA from a third-party lab. Ask the seller for batch-matched documentation.
GLP-1s reduce appetite but do not eliminate it. Some people unconsciously compensate for reduced meal size with more frequent snacking or higher-calorie choices.
FIXTrack food intake for one week using an app. Most people are surprised by the results.
GLP-1s create a deficit primarily by reducing appetite. If maintenance calories are very high, the deficit created may be smaller than expected.
FIXAssess total daily energy expenditure and ensure a meaningful deficit (500–750 kcal/day) is maintained.
The body retains water during periods of metabolic change, especially early in a protocol. Weight on the scale may be flat while fat is still being lost.
FIXUse body measurements (waist, hip) alongside scale weight. Take weekly photos. Trust the process for at least 8 weeks.
After significant weight loss, basal metabolic rate decreases. The same deficit that worked at a higher weight may not be enough later.
FIXConsider a diet break (eating at maintenance for 2 weeks), then resume. Reassess caloric targets based on new body weight.
Tirzepatide stored at room temperature degrades rapidly. If your product was warm during shipping or storage, potency may be significantly reduced.
FIXEnsure cold-chain shipping. Store reconstituted peptide at 2–8°C only. Never freeze reconstituted product.
Two of the causes above are supply problems rather than protocol problems: an underfilled vial and a gap between vials. Peso pricing and local stock on the compounds discussed here sit with our partner and supplier. View Primara Labs pricing
Manila plateau workup
The seven causes above are universal. They don't change between Manila and Manchester. What changes here is the diagnostic stack you can run cheaply to confirm or rule each one out. The bloodwork ecosystem in Metro Manila is genuinely the best leverage point for someone stalled at week eight on tirzepatide or retatrutide.
For the underdosed-product hypothesis (R-02): the only definitive answer is a third-party COA on the actual vial you're injecting. Janoshik in the Czech Republic remains the standard: Manila users typically batch three or four vials in a single DHL shipment to amortize the roughly USD 60 to 90 per peptide cost. Turnaround is 14 to 21 days from drop-off in Makati to digital COA. If your supplier provides a recent COA but your numbers don't move, that's the moment to pull a vial off the shelf and run your own.
For the underlying-metabolic-condition hypothesis (the seek-help block above): a full workup at Hi-Precision Diagnostics or Makati Medical Center outpatient runs roughly USD 150 to 250 in Manila: TSH, free T4, fasting insulin, HbA1c, sex-hormone panel for women, full lipid panel, IGF-1. The same panel runs USD 800 to 1,500 in the United States. Endocrinology consults at Makati Med, St. Luke's BGC, and The Medical City run USD 60 to 100 cash and are bookable within a week for non-urgent visits. If you're going to spend USD 200 a month on retatrutide, spending USD 200 once on bloodwork to make sure you're actually responding is the single highest-leverage move you can make.
Sunday-night protocol log
Week eight on tirzepatide and the scale stopped moving. I'd gone from 92.4 kg the morning I landed at NAIA in late October 2025 to 84.1 kg by mid-January 2026, a clean 8.3 kg in eleven weeks at 5mg weekly, sourced from Mounjaro vials at the Glorietta 4 Mercury Drug for USD 290 per box of four. Then February hit and I sat at 83.8 to 84.2 kg for three straight weekly weigh-ins. Same Sunday 9pm injection in my BGC condo, same kitchen scale, same morning fasted protocol. Flat.
I ran the diagnostic stack from the section above before touching the dose. Hi-Precision Diagnostics in Bonifacio Global City, Saturday morning walk-in, full panel for USD 95: TSH, free T4, fasting insulin, HbA1c, full lipid, IGF-1. Results back Monday: HbA1c had dropped from my October baseline of 5.6% to 5.3%, fasting insulin from 14.2 to 9.8 µU/mL, free T4 within range, IGF-1 mid-normal. Nothing flagged. The metabolic engine was responding correctly. I just wasn't in enough deficit anymore. The November-Ken eating like he was still 92 kg had become February-Ken eating like he was 84 kg, which at my reduced BMR was almost exactly maintenance.
Two changes: tracked food for a week with MyFitnessPal: confirmed I was averaging 2,180 kcal against an estimated 2,150 maintenance. Then titrated to 7.5mg the following Sunday, same Mounjaro stock from the same Glorietta 4 Mercury Drug shelf. Two weeks later weight was 82.7 kg. By April 2 it was 80.4 kg. The plateau was real but it was caloric, not pharmacologic, and the Hi-Precision panel saved me from blaming the vial when the vial was working fine. Total cost of the diagnostic detour: USD 95 and one Saturday morning.
What plateaus don’t mean
Jastreboff AM, Aronne LJ, Ahmad NN, et al. · New England Journal of Medicine 387(3):205-216 · 2022
Jastreboff AM, Kaplan LM, Frias JP, et al. · New England Journal of Medicine 389(6):514-526 · 2023
Sumithran P, Prendergast LA, Delbridge E, et al. · New England Journal of Medicine 365(17):1597-1604 · 2011
Fothergill E, Guo J, Howard L, et al. · Obesity (Silver Spring) 24(8):1612-1619 · 2016
Food and Drug Administration of the Philippines · verification.fda.gov.ph · 2026
Our partner and supplier
Primara Labs, our partner and supplier, lists tirzepatide 15mg and retatrutide 15mg in pesos from stock already inside the Philippines. Metro Manila dispatches same day and the rest of the country lands in one to three business days, which is the practical fix for a plateau caused by a missed week rather than a dose. Every order gets 10% off.
View the Primara Labs catalogue