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Callum Armstrong

Callum Armstrong

Superintendent Pharmacist & Independent Prescriber

MPharmIndependent Prescriber (IP)
GPhC Registration: 2220517

Callum Armstrong is a GPhC-registered pharmacist and independent prescriber with over 8 years of clinical experience. Specialising in weight management, hair loss, erectile dysfunction, and dermatology, he combines clinical expertise with a background in digital health and pharmacy software to deliver evidence-based, patient-centred care. As Superintendent Pharmacist at Totiva Health, Callum oversees the clinical governance and quality standards that underpin every service.

8+

Years of experience

Specialises in

Weight LossHair LossErectile DysfunctionDermatologyDigital Health & Pharmacy Software

Articles by Callum Armstrong

Weight Loss

Maintaining Your Weight Loss with Mounjaro

Reached your goal weight with Mounjaro? Learn how to maintain your results long-term with flexible dosing options and lifestyle strategies that work.

10 Mar 20267 min read
Weight Loss

Can You Take Mounjaro Every Two Weeks? Dosing Safety Explained

Stretching Mounjaro doses to every two weeks isn't recommended by medical professionals. Here's why the weekly schedule matters for safety and effectiveness.

7 Mar 20263 min read
Weight Loss

What happens when you stop taking Mounjaro?

Your appetite returns gradually over 4-6 weeks, but most people keep significant weight loss long-term with the right maintenance strategies.

7 Mar 20264 min read
Weight Loss

Peptides for Weight Loss: How GLP-1 Medications Work

GLP-1 peptides like semaglutide and tirzepatide can help you lose 15-20% of body weight by mimicking natural hormones that control appetite and blood sugar.

6 Mar 20264 min read
Weight Loss

Glucomannan Powder: How to Use It Safely for Weight Support

Glucomannan powder can help you feel fuller for longer, but only if you use it correctly. Learn the proper dosage, timing, and safety tips from UK pharmacists.

6 Mar 20264 min read
Weight Loss

When Does Mounjaro Start Suppressing Your Appetite?

Most people notice Mounjaro's appetite-suppressing effects within 1-2 weeks, but it can take longer to reach full effectiveness as your dose increases.

5 Mar 20264 min read
Weight Loss

How to Store Mounjaro: Essential Storage Guidelines

Store Mounjaro pens correctly to maintain effectiveness. Refrigerate unused pens at 2-8°C or keep at room temperature for up to 30 days.

5 Mar 20264 min readReviewed
Weight Loss

Mounjaro and pancreatitis risk: What to watch for

Pancreatitis affects less than 1% of Mounjaro users, but the symptoms can be serious. Learn the warning signs and when to seek help.

5 Mar 20264 min read
Weight Loss

Mounjaro Needle Size: 4mm vs 6mm vs 8mm - Which is Best?

Confused about Mounjaro needle sizes? We explain why 4mm needles are recommended, how they compare to longer options, and tips for comfortable injections.

4 Mar 20265 min readReviewed
Weight Loss

Mounjaro during pregnancy and breastfeeding - UK safety guidance

Current UK guidance on Mounjaro safety during pregnancy, planning conception, and breastfeeding - what the evidence shows and when to stop treatment.

4 Mar 20264 min read
Weight Loss

Mounjaro Dizziness: Why It Happens and How to Manage It

Dizziness affects up to 1 in 10 Mounjaro users. Learn why it happens, how long it lasts, and proven ways to reduce your risk safely.

4 Mar 20264 min read
Weight Loss

Does Mounjaro cause tiredness? Managing fatigue while taking tirzepatide

Up to one in ten people feel tired on Mounjaro. Learn why this happens, how long it lasts, and proven ways to boost your energy levels naturally.

3 Mar 20264 min read
Weight Loss

Amycretin Weight Loss Pill: How It Works and When It's Coming

Novo Nordisk's promising new weight loss pill Amycretin targets two hunger hormones and shows impressive early results, but it won't be available until 2030.

3 Mar 20264 min read
Pharmacy Guides

Does Rybelsus Cause Yeast Infections?

Rybelsus doesn't directly cause yeast infections, but diabetes itself increases your risk. Learn how to spot symptoms and protect yourself while taking this medication.

2 Mar 20264 min readReviewed
Weight Loss

Wegovy Costs in the UK: NHS vs Private Pricing Breakdown

Wegovy costs £100-300 monthly privately or £9.90 per prescription on NHS (where eligible). Find out exact costs and eligibility criteria.

2 Mar 20265 min read
Weight Loss

Mounjaro UK Pricing: NHS vs Private Costs Compared

Mounjaro costs £150-250 monthly privately, but NHS availability varies. Compare your options and understand eligibility requirements.

2 Mar 20263 min read
Weight Loss

How Long Does Mounjaro Stay in Your System?

Mounjaro takes around 5 weeks to completely leave your body after your last injection. Here's what affects elimination and when to expect it cleared.

28 Feb 20264 min readReviewed
Weight Loss

Can You Eat Bananas While Taking Mounjaro?

There's no medical reason to avoid bananas on Mounjaro. We explain the myths around potassium, blood sugar, and GI side effects with this popular fruit.

28 Feb 20264 min readReviewed
Pharmacy Guides

Spotting Fake Online Pharmacies When Buying GLP-1 Medications

How to identify legitimate vs rogue pharmacies when buying Mounjaro, Ozempic, or Wegovy online. Essential safety checks before you order.

28 Feb 20264 min readReviewed
Pharmacy Guides

Flying with Mounjaro: UK Airport Rules and Safe Storage Tips

Everything you need to know about taking Mounjaro on flights - UK airport security rules, proper storage methods, and essential travel documentation.

27 Feb 20264 min readReviewed
Weight Loss

Does Mounjaro Cause Lack of Motivation? Understanding Fatigue and Energy Loss

Many Mounjaro users report feeling less motivated or tired. Here's what causes it, how long it lasts, and practical ways to manage energy levels.

27 Feb 20264 min read
Weight Loss

Ozempic vs Mounjaro vs Wegovy Costs in the UK: Price Comparison

Compare the real costs of Ozempic, Mounjaro and Wegovy in the UK. NHS availability, private prices and which offers the best value for weight loss.

25 Feb 20263 min read
Weight Loss

Can You Buy Mounjaro Over the Counter in the UK?

No, Mounjaro cannot be bought over the counter in the UK - it's prescription-only. Here's where you can legally get this weight loss medication.

25 Feb 20264 min readReviewed
Weight Loss

Mounjaro After Gallbladder Removal: Is It Safe?

Can you take Mounjaro after gallbladder surgery? Get clear medical guidance on safety, side effects, and what to expect from your prescription.

25 Feb 20265 min read
Weight Loss

Can Mounjaro Affect Your Period? Understanding Menstrual Changes

Mounjaro can indirectly affect your periods through weight loss, especially if you have PCOS. Here's what to expect and when to seek medical advice.

24 Feb 20264 min read
Weight Loss

Does Ozempic Raise Heart Rate? What You Should Know

Ozempic can cause modest heart rate increases in some patients. Learn about the cardiovascular effects, when to worry, and how to monitor safely.

24 Feb 20264 min read
Weight Loss

Is Berberine a GLP-1 Receptor Agonist? The Science Explained

Berberine isn't a GLP-1 receptor agonist like semaglutide, but it does affect blood sugar and weight. Here's what the research actually shows.

24 Feb 20264 min read
Pharmacy Guides

Is Bass Safe to Eat? UK Guidelines on Mercury, Pregnancy, and Health Benefits

Bass is safe to eat when properly prepared, but pregnant women should limit intake to 2 portions per week due to mercury levels. Learn UK guidelines and benefits.

24 Feb 20264 min readReviewed
Weight Loss

Ozempic and Heart Racing: Causes, Warning Signs and What to Do

Experiencing heart racing on Ozempic? Learn about the possible causes, when to seek urgent help, and how to manage cardiovascular symptoms safely.

24 Feb 20264 min read
Hair Loss

Are DHT-Blocking Shampoos Worth Your Money?

Hair thickening shampoos promise to tackle male pattern baldness, but can washing your hair really stop hair loss? We examine the evidence behind DHT-blocking ingredients.

19 Feb 20264 min read
Hair Loss

Male Hair Routine: Simple Care Steps for Every Hair Type

Discover the right hair care routine for your specific hair type, from daily washing schedules to product recommendations that actually work.

18 Feb 20267 min read
Hair Loss

Hair Growth Cycle: Understanding the Three Phases and What Affects Them

Learn how your hair grows through anagen, catagen and telogen phases, plus what factors influence healthy growth and when hair loss becomes concerning.

17 Feb 20268 min read
Hair Loss

Best Haircuts for Men with Thinning Hair: Expert-Recommended Styles

Discover the most flattering haircuts for thinning hair and receding hairlines, plus professional styling tips to maximise volume and confidence.

16 Feb 20265 min read
Pharmacy Guides

Clomid for Men: Off-Label Treatment for Low Testosterone and Infertility

Clomid isn't licensed for men in the UK, but some specialists prescribe it off-label for male fertility issues and low testosterone. Here's what works.

14 Feb 20264 min read
Hair Loss

DHT: The Hair Loss Hormone Explained

DHT drives male pattern baldness by shrinking hair follicles. Learn how this hormone works, what blocks it, and which treatments actually work.

13 Feb 20264 min read
Pharmacy Guides

Can Women Take Viagra? Effects, Safety and Alternatives

Explore whether women can safely take Viagra, its effects on female physiology, and better alternatives for women's sexual health concerns.

13 Feb 20264 min read
Pharmacy Guides

Effects of Not Masturbating: The Science Behind NoFap Claims

NoFap and No Nut November promise amazing benefits from avoiding masturbation. But what does the actual scientific evidence say?

13 Feb 20264 min read
Weight Loss

GLP-1 Patches for Weight Loss: Do They Actually Work?

GLP-1 patches claim to offer weight loss without injections, but there's no scientific evidence they work. Here's what you need to know about these unregulated products.

12 Feb 20266 min read
Pharmacy Guides

Enclomiphene for Low Testosterone: Alternative to TRT

Enclomiphene could offer a fertility-preserving alternative to testosterone replacement therapy, working by stimulating your body's natural hormone production.

12 Feb 20268 min read
Hair Loss

Finasteride Side Effects: What Men Need to Know Before Starting Treatment

Sexual dysfunction affects 2-15% of men taking finasteride. Mental health side effects are rarer but more serious. Here's what UK research shows.

11 Feb 20264 min read
Hair Loss

The Science Behind Why Beards Are So Attractive

From testosterone to evolutionary psychology, discover the fascinating research that explains why facial hair triggers such strong reactions in both men and women.

11 Feb 20268 min read
Erectile Dysfunction

Blue Balls (Epididymal Hypertension): Causes, Symptoms & Treatment

Blue balls is a real medical condition called epididymal hypertension. Learn what causes testicular discomfort after arousal and how to treat it safely.

10 Feb 20265 min read
Weight Loss

Retatrutide Dosage: Starting Doses and Schedules for Weight Loss

Learn about retatrutide starting doses, escalation schedules, and how this promising triple-hormone treatment compares to current weight loss medications.

10 Feb 20268 min read
Pharmacy Guides

How Diet Affects Testosterone Levels: Foods That Support Healthy Production

Discover which foods and nutrients naturally support testosterone production, from zinc-rich oysters to vitamin D sources and practical meal planning tips.

9 Feb 20267 min read
Weight Loss

Does Coke Zero help with weight loss?

Exploring whether Coke Zero's zero calories translate to weight loss benefits, plus the surprising research on diet sodas and body weight.

8 Feb 20265 min readReviewed
Weight Loss

Mounjaro Sulphur Burps: Causes, Duration and Effective Remedies

Experiencing egg-smelling burps on Mounjaro? Learn why they happen, how long they last, and proven ways to reduce them from dietary changes to OTC remedies.

8 Feb 20267 min readReviewed
Pharmacy Guides

How to dispose of your sharps bin safely in the UK

Using weight loss injections? Here's exactly where and how to dispose of your full sharps bin safely and legally in the UK, plus how to get a replacement.

7 Feb 20268 min readReviewed
Hair Loss

How to Reduce DHT for Hair Loss: Medical vs Natural Options

DHT causes 90% of male hair loss. Finasteride blocks DHT production by 70%, while natural options like saw palmetto show limited evidence.

7 Feb 20265 min read
Hair Loss

How Long Does Finasteride Take to Work for Hair Loss?

Most men see visible finasteride results within 3-6 months, with peak effects at 12 months. Here's what to expect from your treatment timeline.

7 Feb 20264 min read
Hair Loss

How Long Does Minoxidil Take to Work? Your Timeline for Hair Regrowth

Minoxidil typically takes 8-12 weeks to show initial results, with noticeable improvements at 4-6 months. Here's what to expect month by month.

7 Feb 20264 min read
Hair Loss

Finasteride vs Minoxidil for Hair Loss: Which Works Better?

Both treatments tackle male pattern baldness differently - finasteride blocks DHT production while minoxidil boosts blood flow to follicles.

7 Feb 20264 min read
Erectile Dysfunction

How Long Does Cialis Last? Duration, Timing, and What to Expect

Cialis typically lasts up to 36 hours and starts working within 30 minutes to 2 hours. Learn about timing, effectiveness, and what affects duration.

7 Feb 20265 min read
Erectile Dysfunction

How Long Does Viagra Last? Timing, Duration and What Affects It

Viagra typically lasts 2-3 hours but can work for up to 6 hours. Learn about timing, what affects how long it works, and how to get the best results.

7 Feb 20264 min read
Erectile Dysfunction

How Often Can You Take Viagra and Sildenafil?

Wondering about Viagra frequency? You can take sildenafil daily if needed, but there are important safety limits to follow for maximum effectiveness.

7 Feb 20264 min read
Pharmacy Guides

How to boost testosterone levels: evidence-based methods that actually work

Low energy and declining muscle mass? Discover proven ways to increase testosterone through lifestyle changes, supplements, and medical treatments.

7 Feb 20265 min read
Erectile Dysfunction

Foods That Can Help Boost Your Libido Naturally

Discover which foods contain compounds that support healthy blood flow, hormone levels, and sexual function - plus practical tips for your diet.

7 Feb 20264 min read
Erectile Dysfunction

How to Take Viagra Safely and Effectively

Essential dos and don'ts for taking Viagra, including timing, dosage, and what to avoid for the best results and minimal side effects.

7 Feb 20265 min readReviewed
Hair Loss

Does Minoxidil Work for Receding Hairlines? The Evidence

Minoxidil can help with receding hairlines, but there's a catch. We explain what works, what doesn't, and why timing matters for frontal hair loss.

7 Feb 20264 min read
Erectile Dysfunction

Erectile Dysfunction in Your 50s: Causes and Treatments That Work

ED affects over half of men in their 50s. Understanding the physical and psychological causes - plus proven treatments - can restore your confidence.

7 Feb 20265 min read
Erectile Dysfunction

Kamagra Oral Jelly: Safety Risks and Legal Alternatives in the UK

Kamagra Oral Jelly may seem like a cheap Viagra alternative, but it's unlicensed in the UK and carries serious safety risks. Here's what you need to know.

7 Feb 20264 min read
Erectile Dysfunction

Does Viagra Keep You Hard After Ejaculation?

Viagra doesn't keep you hard after ejaculation, but it can shorten your recovery time. Learn what really happens and set realistic expectations.

7 Feb 20264 min read
Erectile Dysfunction

Porn-Induced Erectile Dysfunction: Understanding PIED and Recovery Options

PIED affects growing numbers of young men. Learn the science behind porn-induced ED and evidence-based approaches to recovery and treatment.

7 Feb 20264 min read
Weight Loss

Mounjaro Dosage Guide: From 2.5mg to 15mg Explained

Understand how Mounjaro doses increase from 2.5mg to 15mg over 16 weeks, which dose is most effective for weight loss, and what maintenance dosing involves.

7 Feb 20264 min readReviewed
Weight Loss

Mounjaro timeline: when to expect weight loss results

Understand what happens each month on Mounjaro treatment, from initial side effects to significant weight loss over 18 months.

7 Feb 20267 min read
Weight Loss

Where to buy retatrutide in the UK

Retatrutide isn't legally available in the UK yet, but social media sellers are exploiting loopholes. Here's what you need to know about safety and alternatives.

7 Feb 20267 min read
Weight Loss

How Retatrutide Works: The Triple-Action Weight Loss Injection Explained

Retatrutide targets three hormone receptors simultaneously - GLP-1, GIP, and glucagon - potentially offering superior weight loss to current injections.

7 Feb 20266 min read
Weight Loss

Mounjaro Golden Dose: Why the Fifth Dose Isn't Safe to Use

The leftover liquid in your Mounjaro pen after four doses isn't a bonus - it's a safety feature. Here's why using the 'golden dose' can be dangerous.

6 Feb 20264 min read
Pharmacy Guides

When to Take Magnesium: Morning or Night Timing for Better Results

The timing of your magnesium supplement matters less than consistency, but certain forms work better at specific times for sleep, energy, and digestion.

5 Feb 20264 min readReviewed
Weight Loss

Weight Loss Injections: How Effective Are They for Long-Term Results?

Weight loss injections like Wegovy and Mounjaro help people lose 15-20% of body weight in clinical trials. Find out if they're right for you.

4 Feb 20264 min read
Weight Loss

How Much Protein Is in an Egg? Complete Nutritional Breakdown

A large egg contains 6.3g of complete protein with all essential amino acids. Discover egg nutrition facts and how they fit into your daily protein needs.

4 Feb 20265 min readReviewed
Weight Loss

Calories in Medjool dates: nutritional facts and weight management tips

Discover exactly how many calories are in Medjool dates, their nutritional benefits, and how they fit into a healthy weight management plan.

4 Feb 20264 min readReviewed
Weight Loss

Switching Between Mounjaro and Wegovy: What Actually Happens

Thinking of switching weight loss medications? Here's what your doctor considers when moving between Mounjaro and Wegovy, including dosing and timelines.

4 Feb 20267 min readReviewed
Weight Loss

Weight Loss Supplements That Actually Work: A UK Pharmacist's Guide

Discover which weight loss supplements have scientific backing and are regulated in the UK, plus what to avoid from a GPhC-registered pharmacist.

4 Feb 20267 min read
Weight Loss

UK Weight Loss Diet Plan: Evidence-Based Meal Planning for Sustainable Results

Get a practical 7-day meal plan designed for UK dieters, plus shopping lists, prep tips, and evidence-based advice from registered pharmacists.

3 Feb 20268 min read
Hair Loss

Does Finasteride Lower Testosterone? The Science Behind the Claims

Worried finasteride might tank your testosterone? The surprising answer involves a temporary rise followed by your body's clever balancing act.

31 Jan 20267 min read
Weight Loss

How to Take Mounjaro at Home: A Patient Guide from Totiva Health

A pharmacist-led guide from Totiva Health explaining how Mounjaro works and how to inject it safely at home, with clear steps and safety advice.

13 Jan 20264 min readReviewed
Weight Loss

How to Take Wegovy at Home: A Patient Guide from Totiva Health

Learn how to take Wegovy safely at home with this pharmacist-written guide from Totiva Health, covering injection steps, dosing, and safety advice.

13 Jan 20264 min readReviewed