3D medical illustration of a knee joint with golden platelet-rich plasma particles flowing in

Regenerative Medicine at UPC

Our clinic specializes in innovative regenerative therapies to enhance recovery and relieve chronic pain.

From joint pain and tendon or ligament injuries to spine-related conditions — including sports injuries of the shoulder, elbow, and knee — UPC’s regenerative treatments are designed to support a quicker recovery and return to activity. Care begins with a consultation at our Riverside or Menifee clinic, where Dr. Guiang evaluates your condition and builds a treatment plan around it. Looking for a PRP for knee pain specialist? We offer ultrasound-guided knee PRP in Riverside and Menifee.

Now open in Menifee: your first PRP facial is $299 (reg. $700).
Physician-performed in our new aesthetics suite at 27990 Sherman Rd. Book by Nov 14, 2026 and mention code MENIFEE299.
New aesthetics patients only (current UPC pain patients welcome), 1 per person, treatment by 12/31/26. Complimentary 10-minute consult required (card on file holds your appointment; $25 no-show fee). Doesn’t combine with the 4-for-$2,500 package. Results vary. Cosmetic use of PRP is off-label. Good Faith Estimate available.

Pain Therapies

PRP for Joint Pain

Platelet-rich plasma injections, ultrasound-guided

PRP for Spine Pain

Physician-performed PRP for back and neck pain

PRP for Soft Tissue

PRP for tendon, ligament and sports injuries

Ketamine Infusions
IV Lidocaine Infusions
IV Infusions for Pain
Red Light Therapy
Therapeutic Botox
Prolotherapy — dextrose injections for tendon and ligament pain in Riverside and Menifee, CA
Low Dose Naltrexone
Nutraceuticals

Wellness and Aesthetics

PRP Hair Restoration
PRP/PRF Skin Rejuvenation

New in Menifee: first PRP facial $299 (reg. $700). New aesthetics patients, book by Nov 14. Book now

Red Light Therapy
Peptide Therapies

Awaiting FDA Clarity

IV Infusion Wellness
Botox for Wrinkles

Mental Health Treatments

Ketamine Infusions
Stellate Ganglion Block
Ketamine Infusions

What Our Patients Say

Real reviews from our Riverside and Menifee clinics, via Google.

“Great”

Gig Galang

in the last week · Riverside  on Google

“I cannot say enough wonderful things about my pain management doctor,Dr. Rainier Guiang. He is truly an amazing physician, and I wouldn’t trust anyone else with my care. What I appreciate most is that he doesn’t just throw medication at you and…”

Vicki Kaauamo

a month ago · Riverside  on Google

“This was a godsend. I was having back troubles for the past few years and I’ve tried everything from physical therapy to peptides nothing really worked until I got the PRP shot. I’m over a month in and feel like my back…”

Michael Mathews

a month ago · Riverside  on Google

“My experience here has been great so far. Dr. Guiang is very kind, patient, and doctor that is willing to listen. I’m very grateful for him to take me on as a patient because my prior ketamine infusion clinic has closed. I’m…”

Ryanne Tarease

2 months ago · Riverside  on Google

“I had an amazing experience with Dr.Guiang and my PRP (platelet-rich plasma) injection for my knee! I had the procedure done on July 1st, and I’m so happy with the results. I had zero pain afterward and have been feeling amazing ever…”

Yadira Rivera

2 months ago · Menifee  on Google

“I have been under the care of Dr. Rainier Guiang for years now. I suffer from lower back, and neck pain. I find Dr. Guiang to be a gentle and very sympathetic doctor. He has never once rushed me through an appointment.…”

Jeri Fernquist

3 months ago · Riverside  on Google

Review us on Google

Take a One-Minute Tour of Our Clinic

Celluma Elite red light therapy device in use

Inside the clinic

Red light therapy at UPC.

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